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.
a = input()
num = a.find("AB")
flag = True
if(num==-1):
    flag = False
else:
    b = a[0:num]
    c = a[num+2:]
    a = b+c
    if(a.find("BA")==-1):
        flag = False
if(flag==True):
    print("Yes")
else:
    print("No")
