diff --git a/main.py b/main.py
index 99603fd..8ee456e 100644
--- a/main.py
+++ b/main.py
@@ -3,13 +3,28 @@
 
 
 def congratulate_user():
-    print(f"Congratulations, you won! your words: {guesses}")
+    print("=============================")
+    print("= Congratulations! You won! =")
+    print("=============================")
+    print(f"Your words: {guesses}")
 
 
 def is_game_over():
     return guessed == WORDS_TO_WIN or errors == ERRORS_TO_LOSE
 
 
+def guess_is_valid(candidate):
+    for letter in candidate:
+        if letter not in word:
+            print(f"You can not use letter {letter}")
+            return False
+        count = word.count(letter)
+        if count < candidate.count(letter):
+            print(f"You can use letter {letter} only {count} times")
+            return False
+    return True
+
+
 guessed = 0
 errors = 0
 
@@ -25,9 +40,15 @@ def is_game_over():
 print(f"Can you make up {WORDS_TO_WIN} words from letters in word provided by me?")
 print(f"Your word is '{word}'")
 
-
+already=[]
 while not is_game_over():
     guess = input("Your next take: ")
+    while guess in already:
+        guess = input("This word already entered, try another: ")
+    already.append(guess)
+    if not guess_is_valid(guess):
+        continue
+
     if guess in full_list:
         guessed += 1
         guesses.append(guess)
@@ -37,4 +58,7 @@ def is_game_over():
         print(f"That's right! {WORDS_TO_WIN - guessed} to go")
     else:
         errors += 1
-        print(f"Oops :( No such word, you have {ERRORS_TO_LOSE - errors} lives more")
+        if errors==3:
+            print("Sorry you have no lives, you lost")
+        else:
+            print(f"Oops :( No such word, you have {ERRORS_TO_LOSE - errors} lives more")