Osajono

public class Osajono{
    
    public static void main(String[] args){
        
        
        IO io = new IO();
        
        String s = io.next();
        
        long ans = 0;
        
        int[] table = new int[26];
        
        for(int i = 0; i < s.length(); i++){
            table[s.charAt(i) - 'A']++;
        }
        
        for(int i: table){
            ans += i * (i + 1) / 2;
        }
        
        io.println(ans);
        
        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