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

int main() {
	string kata1,kata2;
    string jumlah;
    getline(cin,kata1);
    getline(cin,kata2);
    cout << kata1 << endl;
    cout << kata2 << endl;

    int panjang1 = kata1.size();
    int panjang2 = kata2.size();
    cout << panjang1 << " " << panjang2 << endl;
    // cout << panjang2 << endl;
    // kata1.append(kata2);
    jumlah = kata1 + kata2;
    cout << jumlah << endl;  why test case failed link https://www.hackerrank.com/challenges/c-tutorial-strings

    kata1[0] = kata2[0];
    kata2[0] = kata1[0];
    cout << kata1 << " " << kata2 << endl;