Osajono

public class ratkaisu {
	
	public static void main(String[] args) {
		IO io = new IO();;
		String a = io.next();
	
		int sum = 0;
	
		for (int i = 'A'; i <= 'Z'; i++){
			long n = 0;
			for (int j = 0; j < a.length(); j++){  //20
				if (a.charAt(j) == i){
					n++;
				}
			}
			sum += ((n*(n+1))/2);
		}
		io.println(sum);
		io.close();
	}
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: WRONG ANSWER

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: WRONG ANSWER

Test 14

Group: 3

Verdict: WRONG ANSWER

Test 15

Group: 3

Verdict: WRONG ANSWER