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