p02753 AtCoder Beginner Contest 158 - Station and Bus
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`.

Examples

Input

ABA


Output

Yes


Input

BBA


Output

Yes


Input

BBB


Output

No
```python
S = input()

print("No" if len(set(S)) == 1 else "Yes")

```