Osajono

import java.util.*;

public class Aleksi {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.nextLine();
		
		HashMap<Character, Integer> map = new HashMap();
		long montako = s.length();
		for (int i = 0; i < s.length(); i++) {
			char c = s.charAt(i);
			
			if (map.containsKey(c)) {
				montako += map.get(c);
				map.put(c,map.get(c)+1);
				
			} else {
				map.put(c,1);
			}
		}
		System.out.println(montako);

	}
}

Test 1

Subtask: 1

Verdict: ACCEPTED

Test 2

Subtask: 1

Verdict: ACCEPTED

Test 3

Subtask: 1

Verdict: ACCEPTED

Test 4

Subtask: 1

Verdict: ACCEPTED

Test 5

Subtask: 1

Verdict: ACCEPTED

Test 6

Subtask: 2

Verdict: ACCEPTED

Test 7

Subtask: 2

Verdict: ACCEPTED

Test 8

Subtask: 2

Verdict: ACCEPTED

Test 9

Subtask: 2

Verdict: ACCEPTED

Test 10

Subtask: 2

Verdict: ACCEPTED

Test 11

Subtask: 3

Verdict: ACCEPTED

Test 12

Subtask: 3

Verdict: ACCEPTED

Test 13

Subtask: 3

Verdict: ACCEPTED

Test 14

Subtask: 3

Verdict: ACCEPTED

Test 15

Subtask: 3

Verdict: ACCEPTED