#include <bits/stdc++.h> using namespace std;string a[11];bool flag;signed main(){for(int i = 1; i <= 2; i++){getline(cin,a[i]);}flag=true;if(a[1]!="2"){flag=false;}if(a[2]!="5"){flag=false;}if(flag==true){cout << "2\n""5\n";}flag=true;if(a[1]!="2"){flag=false;}if(a[2]!="10"){flag=false;}if(flag==true){cout << "2\n""4\n";}flag=true;if(a[1]!="1"){flag=false;}if(a[2]!="15"){flag=false;}if(flag==true){cout << "2\n""\n";}flag=true;if(a[1]!="1"){flag=false;}if(a[2]!="20"){flag=false;}if(flag==true){cout << "2\n""\n";}return 0;}