Problem Statement
In AtCoder City, there are three stations numbered 11, 22, and 33.
Each of these stations is operated by one of the two railway companies, A and B. A string SS of length 33 represents which company operates each station. If S_iSi is A, Company A operates Station ii; if S_iSi is B, Company B operates Station ii.
To improve the transportation condition, for each pair of a station operated by Company A and one operated by Company B, there will be a bus service connecting them.
Determine if there is a pair of stations that will be connected by a bus service.
Constraints
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Each character of SS is A or B.
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|S| = 3∣S∣=3
Input
Input is given from Standard Input in the following format:
SS
Output
If there is a pair of stations that will be connected by a bus service, print Yes; otherwise, print No.