#include <iostream>
#include <string>
#include <cctype>
using namespace std;

int main () {
    string userInput;
    float hasDigit = 1; //if has digit > 0 then the string has a digit
    int i;

    getline(cin, userInput);

    i = userInput.length();

    /*do {
        hasDigit = hasDigit * isdigit(userInput.at(i));
        i--;
    } while(i > 0);*/

    for (0; i < 0; --i) {
        hasDigit = hasDigit * isdigit(userInput.at(i));
    }

    if (hasDigit != 0) {
        cout << "yes" << endl;
    }
    else if (hasDigit == 0) {
        cout << "no" << endl;
    }

    return 0;
}