diff --git a/lesson_1/solution_1.py b/lesson_1/solution_1.py
new file mode 100644
index 0000000..73a4234
--- /dev/null
+++ b/lesson_1/solution_1.py
@@ -0,0 +1,2 @@
+numbers = list(map(float, input().split()))
+print(sum(numbers))
\ No newline at end of file
diff --git a/lesson_1/solution_2.py b/lesson_1/solution_2.py
new file mode 100644
index 0000000..b463fca
--- /dev/null
+++ b/lesson_1/solution_2.py
@@ -0,0 +1,5 @@
+st = input()
+while True:
+    rule = input()
+    st = st.replace(rule[0], rule[3])
+    print(st)
\ No newline at end of file
diff --git a/lesson_1/solution_3.py b/lesson_1/solution_3.py
new file mode 100644
index 0000000..7b7b0bc
--- /dev/null
+++ b/lesson_1/solution_3.py
@@ -0,0 +1,3 @@
+numbers = list(map(float, input().split()))
+for i in numbers:
+    print(str(int(abs(i))) + ' ', end = '')
\ No newline at end of file
diff --git a/lesson_1/solution_4.py b/lesson_1/solution_4.py
new file mode 100644
index 0000000..a38d524
--- /dev/null
+++ b/lesson_1/solution_4.py
@@ -0,0 +1,5 @@
+numbers = list(map(float, input().split()))
+summ = 0
+for i in numbers:
+    summ += i*i
+print(summ)
\ No newline at end of file
diff --git a/lesson_1/solution_5.py b/lesson_1/solution_5.py
new file mode 100644
index 0000000..f4fe531
--- /dev/null
+++ b/lesson_1/solution_5.py
@@ -0,0 +1,13 @@
+s = list(input())
+d = int(input()) % 26   #delta
+
+for i in range(len(s)):
+    tmp = d
+    if s[i] == ' ':
+        continue
+    elif ord(s[i]) + tmp > ord('z') or ('A' <= s[i] <= 'Z') and (ord(s[i]) + tmp > ord('Z')):
+        tmp -= 26
+    s[i] = chr(ord(s[i]) + tmp)
+
+s = ''.join(s)
+print(s)
\ No newline at end of file