#include<bits/stdc++.h>
using namespace std;
int a;
int main()
{
    string str[4]={"one","two","three","four"};
    cin>>a;
    if(a<1 or a>4){
        cout<<"error"<<endl;
    }else{
         cout<<str[a-1]<<endl;
    }
    return 0;

}