#include<iostream>
using namespace std ;
int main(){
    string s ;
    cin>>s;
    bool sidigitonly = 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";
    }
}