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 contains_AB_and_BA(s):
    if "AB" in s and "BA" in s[s.index("AB")+2:]:
        return True
    if "BA" in s and "AB" in s[s.index("BA")+2:]:
        return True
    return False
s = input()
if contains_AB_and_BA(s):
    print("Yes")
else:
    print("No")