Score : 100 points
In AtCoder City, there are three stations numbered 1, 2, and 3.
Each of these stations is operated by one of the two railway companies, A and B. A string S of length 3 represents which company operates each station. If S_i is A
, Company A operates Station i; if S_i is B
, Company B operates Station i.
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.
A
or B
.Input is given from Standard Input in the following format:
S
If there is a pair of stations that will be connected by a bus service, print Yes
; otherwise, print No
.
ABA
Yes
Company A operates Station 1 and 3, while Company B operates Station 2.
There will be a bus service between Station 1 and 2, and between Station 2 and 3, so print Yes
.
BBA
Yes
Company B operates Station 1 and 2, while Company A operates Station 3.
There will be a bus service between Station 1 and 3, and between Station 2 and 3, so print Yes
.
BBB
No
Company B operates all the stations. Thus, there will be no bus service, so print No
.