7.1.1

#include <iostream>
#include <cmath>

using namespace std;

int Swap(int *x,int *y)
{
    int temp=*x;
    *x=*y;
    *y=temp;
}

int main()
{
    int x,y;
    cin>>x>>y;
    Swap(&x,&y);
    cout<<x<<" "<<y;
}