Osajono

//import java.util.*;

public class ratkaisu {

	//static Scanner scanner = new Scanner (System.in);
	
	public static void main(String[] args) {
		
		IO io = new IO();
		//System.out.println("Input string:");
	
		String a = io.next();
		//String a = scanner.nextLine();
	
		int sum = a.length();
	
		for (int i = 'A'; i <= 'Z'; i++){
			int count = 0;
			for (int j = 0; j < a.length(); j++){  //20
				if (a.charAt(j) == i){
					count++;
				}
			}
			if (count > 0){
				int n = (count-1);
				sum += ((n*(n+1))/2);
			}
		}
	
		io.println(sum);
		//System.out.println(sum);
	
		io.close();
		//scanner.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