#include<iostream>

using namespace std;


int swap(int &a, int &b)  //第二类参数传递，改变形参会影响实参
{
    int t;
    t = a;
    a = b;
    b = t;
}

int main()
{
    int x, y;
    cin >> x >> y;

    swap(x, y);
    cout << x <<' ' << y << endl;
    return 0;
}