Problem:
Score : 100 points

Problem Statement

You are given a 4-character string S consisting of uppercase English letters.
Determine if S consists of exactly two kinds of characters which both appear twice in S.

Constraints

The length of S is 4.

S consists of uppercase English letters.

Input

Input is given from Standard Input in the following format:

S

Output

If S consists of exactly two kinds of characters which both appear twice in S, print Yes; otherwise, print No.

Sample Input 1

ASSA

Sample Output 1

Yes

S consists of A and S which both appear twice in S.

Sample Input 2

STOP

Sample Output 2

No

Sample Input 3

FFEE

Sample Output 3

Yes

Sample Input 4

FREE

Sample Output 4

No

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.util.Scanner;
public class Main{
	public static void main(String[] args) {
		@SuppressWarnings("resource")
		Scanner sc =new Scanner(System.in);
		String str=sc.next();
		String[] a=str.split("");
		if(a[0]==a[1]&&a[0]!=a[2]&&a[0]!=a[3])
			System.out.println("Yes");
		else if(a[0]!=a[1]&&a[0]==a[2]&&a[0]!=a[3])
			System.out.println("Yes");
		else if(a[0]!=a[1]&&a[0]!=a[2]&&a[0]==a[3])
			System.out.println("Yes");
		else
			System.out.println("No");
	}
}