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()
s=s.upper()
s1=s[::-1]
print(s)
if s1==s:
    print("YES")
else:
    print("NO")
   	 	 	 	 	  		     			 		 	 	