#include <iostream>
#include <string>

using namespace std;

void string_update(string &line) {
        cout << "Enter a line of text: ";
        getline(cin,line);

        return;
}

int main() {
    string string1, string2, string3;

    string1="race";
    string2="car";

    string3=string1+string2;

    cout << string3 << endl;

    string3+="s";

    cout << string3 << endl;
    string_update(string3);
    cout << string3 << endl;

    return 0;
}