PROGRAM
import java.util.Scanner;
public class DuplicateLetters{
public static void main(String args[])
{
Scanner scan = new Scanner(System.in);
String letter = scan.next(); // Input from User
String srr[] = letter.split("");
for(int i = 0; i<srr.length;i++){
int count = 1;
if(!srr[i].equals("$")){
for(int j = i+1; j<srr.length;j++
