#include<iostream>
#include<string>
using namepsace std;
bool isOnlyDigits(const string& s) {
    for (char c : s) {
        if(!digit(c)) {
            return false;
        }
    } 
    return true;
}
int main() {
    string s;
    cin>> s;
    if(isOnlyDigits(s)) {
        cout<< "True" << endl;
    }else{
        cout<< "False" << endl;
    }
    return 0;
}