#include<iostream>
using namespace std;
int main(){
    string s;
    cin>>;
    bool isdigitonly=true;
    for(int i=0; i<s.length(); i++)
    {
        if(s[i]<'0' || s[i]>'9'){
            isdigitonly=false;
        }
    }
    if( isdigitonly){
        cout<<"True";
    }
    else{
        cout<<"False";
    }
}