Envío 6879

Código

class Main {
	public static void main(String[] args) {
		
		java.util.Scanner inp = new java.util.Scanner(System.in);
		String word = inp.nextLine();
		String letters[] = word.split("");
		boolean found = false;
		
		for(int i = 0; i < letters.length; i++) {
			for(int j = 0; j < letters.length; j++) {
				if(i == j){
					continue;
				} else if(letters[i].equals(letters[j])) {
					found = true;
					break;
				}
			}
		}
		
		if(found) System.out.print("yes");
		else System.out.print("no");
		
		inp.close();
	}
}