#include <iostream>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <cmath>
#include <string>
#include <stack>

using namespace std;

int main() {

    string a = "abc";
    string b = "abcd";

    string *numa = &a;

    string *numb = &b;

    string *temp = new string();

    *temp = a;
    a = *numb;
    b = *temp;

        return 0;
    }