import java.util.*;

public class divisibility {

    static int Digit(char ch) {
	if (ch >= '0' && ch <= '9') return (int)(ch - '0');
	if (ch >= 'A' && ch <= 'Z') return (int)(ch - 'A') + 10;
	return (int)(ch - 'a') + 36;
    }

    public static void main(String[] args) {
	Scanner s = new Scanner(System.in);
	while (true) {
	    String t = s.nextLine();
	    if (t.equals("end")) break;
	    
	    int sum = 0;
	    for (int i = 0; i < t.length(); i++)
		sum += Digit(t.charAt(i));
	    
	    System.out.println(sum % 61 == 0 ? "yes" : "no");
	}
    }
}