#include <bits/stdc++.h>
using namespace std;
int main() {
string letra;
cin >> letra;
if(letra == "one") {
cout << 1 << "\n";
} else if(letra == "two") {
cout << 2 << "\n";
} else if(letra == "three") {
cout << 3 << "\n";
} else if(letra == "four") {
cout << 4 << "\n";
} else if(letra == "five") {
cout << 5 << "\n";
} else {
cout << "error\n";
}
return 0;
}
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