import java.io.* ;
public class divisibility {
   public static void main(String[] args) throws Exception {
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in)) ;
      while (true) {
         String s = br.readLine() ;
         if (s.equals("end"))
            break ;
         int sum = 0 ;
         for (char c : s.toCharArray()) {
            if (c < 'A')
               sum += c - '0' ;
            else if (c < 'a')
               sum += c - 'A' + 10 ;
            else
               sum += c - 'a' + 36 ;
         }
         System.out.println(sum % 61 == 0 ? "yes" : "no") ;
      }
   }
}