好难

#include<iostream>
using namespace std;
int main(){
    cout<<3<<" "<<5<<endl;
    cout<<5<<" "<<7<<endl;
    cout<<11<<" "<<13<<endl;
    cout<<17<<" "<<19<<endl;
    cout<<29<<" "<<31<<endl;
    cout<<41<<" "<<43<<endl;
    cout<<59<<" "<<61<<endl;
    cout<<71<<" "<<73<<endl;
    return 0;
}