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.
s = input("")
f = False
if "AB" in s:
    c1 = s.find("AB")
    s= s[0:c1]+ s[c1+2:]
    print(s)
    if "AB" in s:
        f = True
    if "BA" in s:
        f = True

if f == True:
    print("Yes")
else:
    print("NO")