#include <iostream>
#include <fstream>
#include <algorithm>
#include <vector>
using namespace std;

int main(){
    ifstream input_file_stream("http://www.geocities.jp/unko_der/sample_01.txt");
    string pi;
    input_file_stream >> pi;
    pi[0] = '3';
    string input_pi;
    cin >> input_pi;
    for(int i = 0; i < input_pi.size(); i++){
        if(input_pi[i] != pi[i]){
            cout << input_pi[i] << " " << pi[i] << endl;
        }
    }
}