import java.util.*;

public class divisibility {
	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		while (true) {
			String text = s.next();
			if (text.equals("end")) break;
			int num = 0;
			for (int i = 0; i < text.length(); i++) {
				num += getNum(text.charAt(i));
			}
			if (num % 61 == 0) System.out.println("yes");
			else System.out.println("no");
		}
	}
	
	public static int getNum(char c) {
		if (c >= '0' && c <= '9') return c - '0';
		if (c >= 'A' && c <= 'Z') return c - 'A' + 10;
		return c - 'a' + 36;
	}
}