#include<bits/stdc++.h>
using namespace std;
int main()
{
int a = 5;
if(a < 3) {
cout<<"one"<< endl;
}
else if(a < 10) {
cout<<"two"<< endl; }
else if(a < 20) { cout<<"three"<< endl;
}
else {
cout<<"four"<< endl; }
}
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