Osajono

public class Ratkaisu {
public static void main(String[] args) {
	IO io = new IO();
	String m = io.next();
        String ref = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        int l = m.length();
        int x = 0;
        int temp;
        char tmp;
        for(int i=0;i<26;i++){
            temp = 0;
            tmp = ref.charAt(i);
            for(int y=0;y<l;y++){
                if(tmp == m.charAt(y)){
                    temp++;
                }
            }
            x+=(temp*(temp+1))/2;
        }
	io.println(x);
        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