#include <iostream>
#include <string>

using namespace std;

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;
}

int main() {
  while (1) {
    string s;
    cin >> s;
    if (s == "end") break;

    int sum = 0;
    for (size_t i = 0; i < s.length(); i++)
      sum += Digit(s[i]);

    cout << (sum % 61 == 0 ? "yes" : "no") << endl;
  }
}