Problem Statement

You are given a string S of length N consisting of lowercase English letters.
If there are any adjacent occurrences of a and b in S, print Yes; otherwise, print No. (The order of a and b does not matter.)

Input

The input is given from Standard Input in the following format:
N
S

Output

If there are any adjacent occurrences of a and b in S, print Yes; otherwise, print No.

Constraints

• $2 \leq N \leq 100$
• S is a string of length N consisting of lowercase English letters.

Sample Input 1

3
abc

Sample Output 1

Yes

The string abc has a as the first character and b as the second character, which are adjacent. Thus, print Yes.

Sample Input 2

2
ba

Sample Output 2

Yes

The string ba has a as the second character and b as the first character, which are adjacent. (Note that the order of a and b does not matter.)

Sample Input 3

7
atcoder

Sample Output 3

No

见题面 Input 部分

见题面 Output 部分