Osajono

import java.util.Arrays;

public class Osis2 {
	public static void main(String[] args) {
		IO oi = new IO();
		
		String str = oi.next();
		char[] arr = str.toCharArray();
		Arrays.sort(arr);
		int len = arr.length;
		int result = len;
		
		char last = ' ';
		int count = 0;
		
		for(int i = 0; i < len; i++) {
			if(last != arr[i]) {
				last = arr[i];
				count = 0;
			} else {
				count++;
				result += count;
			}
		}
		
		oi.println(result);
		oi.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