P4.03 P65437 Swap

#include <iostream>
using namespace std;

void swap2(int& a, int& b) {
    int c=a;
    a=b;
    b=c;
}

int main(){
    int x,y;
    cin >> x >> y;
    swap2(x,y);
    cout << x << " " << y << endl;
}