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()
ba1 = min(s.rfind('BA'), s.find('BA'))
ab1 = max(s.find('AB'), s.rfind('AB')) 
ba2 = max(s.rfind('BA'), s.find('BA'))
ab2 = min(s.find('AB'), s.rfind('AB')) 


print(ba1, ab1, ba2, ab2)
if ab1 >= 0 and ba1 >= 0 and (abs(ab1-ba1) > 1 or abs(ab2-ba2) > 1):
	print('YES')
else:
	print('NO') 
