# Two Substrings

Time Limit: 2 seconds

Memory Limit: 256 megabytes

## Description

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).

## Input

The only line of input contains a string s of length between 1 and 105 consisting of uppercase Latin letters.

## Output

Print "YES" (without the quotes), if string s contains two non-overlapping substrings "AB" and "BA", and "NO" otherwise.

## Sample Input

InputABAOutputNOInputBACFABOutputYESInputAXBYBXAOutputNO

## Sample Output

None

## Hint

In the first sample test, despite the fact that there are substrings "AB" and "BA", their occurrences overlap, so the answer is "NO".

In the second sample test there are the following occurrences of the substrings: BACFAB.

In the third sample test there is no substring "AB" nor substring "BA".

None