Osajono

//package dt;

import java.util.HashMap;
import java.util.Scanner;

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

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: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED