CodinGame_2023_09_01__19_01_30__concat.cpp

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cstdlib>

using namespace std;

/**
    01 Test 1
    Entrée
    Sortie attendue
    APP
    TITLE
    APPLE

    02 Test 2
    Entrée
    Sortie attendue
    DUR
    CORTLEX
    DURTLEX

    03 Test 3
    Entrée
    Sortie attendue
    TEST
    CASE
    TEST

    04 Test 4
    Entrée
    Sortie attendue
    GOO
    FOOD
    GOOD
 */

int main(void)
{
    string first;
    getline(cin, first);
    string second;
    getline(cin, second);
    cout << first + second.substr(first.length(), second.length()-1) << endl;
    return EXIT_SUCCESS;
}