#include <iostream>
#include <string>
#include <algorithm>
 
int main() {
    std::string s1 { "azerty" };
    std::string s2 { "123456" };
    std::swap(s1, s2);
    std::cout << s1 << std::endl;
    std::cout << s2 << std::endl;
    
    int x { 123 };
    int y { 456 };
    std::swap(x, y);
    std::cout << x << std::endl;
    std::cout << y << std::endl;
}