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()