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()
b=a.split()
for i in range(len(b)-1):
    if a[i]=='A' and a[i+1]=='B'：
        return ‘Yes’
    elif a[i]=='B' and a[i+1]=='A':
        return 'Yes'
    else:
        if i==len(b)-2:
            return 'No'
        else:
            continue
 					 	  	 	  		  	  	   	  	