#include <stdlib.h>
#include <iostream>
#include <string>
#include <fstream>
#include <iomanip>

using namespace std;



int main() {
    int a[]={3,4,5};

    for(int i=0;i<=2;i++)
        cout << i[a] << endl;
    cout << endl;

    int i=1;
    while(i!=0) {
        cin >> i;

        if(cin.fail()) {
            cout << "error"  << endl;
            cin.clear();
            cin.ignore();
            cout << "\a";
        }
        else cout << i << endl;

    }

    return 0;
}