Problem Description

You are given a string $ S $ of length $ N $. Each character in $ S $ is one of A, B, C, D, or E.

If $ S $ contains at least 3 different characters, output Yes; otherwise, output No.

Input Format

The input is given from the standard input in the following format:

$ N $ $ S $

Output Format

Output Yes if $ S $ contains at least 3 different characters; otherwise, output No.

Sample Input and Output

Sample Input #1

4
BABE

Sample Output #1

Yes

Sample Input #2

3
DAD

Sample Output #2

No

Sample Input #3

5
BACED

Sample Output #3

Yes

Sample Input #4

28
EEEEEEEEEEEEEEEEEEEEEEEEEEEE

Sample Output #4

No

Notes/Hints

Constraints

• $1 \leq N \leq 100$.
• $ S $ is a string of length $ N $.
• Each character in $ S $ is one of A, B, C, D, or E.
• $ N $ is an integer.

Sample Explanation 1

The characters that appear are A, B, and E, which are 3 different types. Since at least 3 different characters appear, output Yes.

Sample Explanation 2

The characters that appear are A and D, which are 2 different types. Since less than 3 different characters appear, output No.

见题面 Input 部分

见题面 Output 部分