You are given string *s*. Your task is to determine if the given string *s* contains two non-overlapping substrings "AB" and "BA" (the substrings can go in any order).
The only line of input contains a string *s* of length between 1 and 10<sup class="upper-index">5</sup> consisting of uppercase Latin letters.
def resolve(input_str: str):
    if 'AB' in input_str and 'BA' in input_str[input_str.index('AB')+2:]:
        print("YES")
    elif 'BA' in input_str and 'AB' in input_str[input_str.index('BA')+2:]:
        print("YES")
    else:
        print("NO")

data = input().strip()
resolve(data)
