diff --git a/README.md b/README.md
index f829d09..3a8bca7 100644
--- a/README.md
+++ b/README.md
@@ -13,3 +13,9 @@
 1. Go to any IDE.
 2. Refresh the site. (Yes... I will fix this)
 
+## Buttons 
+
+- `[copy stderr]` - copies the entire stderr output from the program
+- `[copy stdin]` - copies only lines prefixed with `?>` and removes this prefix. This allows you to write program input on stderr, retrieve it, and run identical game locally. Prefix can be changed in [contentscript.js](copy-extension/contentscript.js), but requires reinstalling the extension.
+
+Note: if the string to copy is empty, nothing will hapen after clicking a button (no message).
\ No newline at end of file
diff --git a/copy-extension/contentscript.js b/copy-extension/contentscript.js
index 9043610..8b2d0a8 100644
--- a/copy-extension/contentscript.js
+++ b/copy-extension/contentscript.js
@@ -1,3 +1,9 @@
+const stdinPrefix = "?>"
+
+// todo make buttons next to each other
+// todo more versions?: ALL; STDIN; DEBUG; FULL JSON
+
+
 const copyToClipboardAsync = str => {
     if (navigator && navigator.clipboard && navigator.clipboard.writeText)
         return navigator.clipboard.writeText(str);
@@ -20,7 +26,7 @@ loading = setInterval(function () {
         return;
     }
 
-    const title = document.getElementsByClassName("cg-ide-title");
+    const title = document.getElementsByClassName("league-value"); // league-value // cg-ide-title
 
     if (!title || title.length == 0) {
         console.log('Game title not loaded!');
@@ -28,10 +34,13 @@ loading = setInterval(function () {
     }
 
 
-    let button = document.createElement("Button");
-    let text = document.createTextNode("Copy stderr");
+    let buttonStderr = document.createElement("Button");
+    let textStderr = document.createTextNode("[copy stderr]");
+    copyNodeStyle(title[0], buttonStderr);
 
-    copyNodeStyle(title[0], button);
+    let buttonStdin = document.createElement("Button");
+    let textStdin = document.createTextNode("[copy stdin]");
+    copyNodeStyle(title[0], buttonStdin);
 
     const rank = document.getElementsByClassName("rank-wrapper");
 
@@ -42,11 +51,45 @@ loading = setInterval(function () {
         // TODO: Sometimes rank could not be loaded
 
         const rankStyle = window.getComputedStyle(rank[0]);
-        button.style.webkitTextFillColor = rankStyle.webkitTextFillColor;
+        buttonStderr.style.webkitTextFillColor = "rgb(146, 150, 155)"  //rankStyle.webkitTextFillColor;
+        buttonStdin.style.webkitTextFillColor = "rgb(255, 255, 255)"  //rankStyle.webkitTextFillColor;
+    }
+
+    buttonStderr.onclick = function (event) {
+        console.log("Button stderr clicked!");
+
+        let elements = document.getElementsByClassName('stderr');
+
+        if (elements.length == 0) {
+            return;
+        }
+
+        let contentStderr = "";
+        let linesStderr = 0;
+
+        for (let turn = 0; turn < elements.length; turn++) {
+            let element = elements[turn];
+            /*
+                element.innerText sometimes have new lines symbols
+                and sometimes doesn't :/
+            */
+
+            // content += elements[turn].innerText + "\n";
+
+            for (let line of element.getElementsByClassName("outputLine")) {
+                contentStderr += line.innerText + "\n";
+                linesStderr += 1;
+            }
+        }
+
+        if (contentStderr.length > 0) {
+            copyToClipboardAsync(contentStderr);
+            alert(`Copied stderr ${linesStderr} lines.`);
+        }
     }
 
-    button.onclick = function (event) {
-        console.log("Button clicked!");
+    buttonStdin.onclick = function (event) {
+        console.log("Button stdin clicked!");
 
         let elements = document.getElementsByClassName('stderr');
 
@@ -54,8 +97,8 @@ loading = setInterval(function () {
             return;
         }
 
-        let content = "";
-        let lines = 0;
+        let contentStdin = "";
+        let linesStdin = 0;
 
         for (let turn = 0; turn < elements.length; turn++) {
             let element = elements[turn];
@@ -67,20 +110,24 @@ loading = setInterval(function () {
             // content += elements[turn].innerText + "\n";
 
             for (let line of element.getElementsByClassName("outputLine")) {
-                content += line.innerText + "\n";
-                lines += 1;
+                if (line.innerText.startsWith(stdinPrefix)) {
+                    contentStdin += line.innerText.substring(2) + "\n";
+                    linesStdin += 1;
+                }
             }
         }
 
-        if (content.length > 0) {
-            copyToClipboardAsync(content);
-            alert(`Copied ${lines} lines.`);
+        if (contentStdin.length > 0) {
+            copyToClipboardAsync(contentStdin);
+            alert(`Copied stdin ${linesStdin} lines.`);
         }
     }
 
-    button.appendChild(text);
+    buttonStderr.appendChild(textStderr);
+    header[0].appendChild(buttonStderr);
 
-    header[0].appendChild(button);
+    buttonStdin.appendChild(textStdin);
+    header[0].appendChild(buttonStdin); // header[0]
 
     console.log('Button is added!');