#include <iostream>
#include <string>
using namespace std;

int main() {
    string player1, player2;
    
    getline(cin, player1);
    getline(cin, player2);
    
    if (player1, player2 != "rock" || player1, player2 != "paper" || player1, player2 != "scissors") {
        cout << "Invalid input" << endl;
        return;
    }
}