Score : $100$ points

Problem Statement

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.

Constraints

• Each character of $S$ is A or B.
• $|S| = 3$

Input

Input is given from Standard Input in the following format:

$S$

Output

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.