Added task 3

basic programming/3rd task/5.py

@@ -0,0 +1,16 @@
+def sequence_has(txt: str) -> bool:
+    i = 0
+    while i < len(txt) - 1:
+        if txt[i] == txt[i + 1]:  # אם יש תו שחוזר ברצף
+            return True
+        i += 1
+    return False
+
+def main_5ex():
+    txt1 = "apple"
+    print(f'{txt1} contains a sequence' if sequence_has(txt1) else f'{txt1} does not contains a sequence')
+
+    txt2 = "banana"
+    print(f'{txt2} contains a sequence' if sequence_has(txt2) else f'{txt2} does not contains a sequence')
+
+main_5ex()