#include <bits/stdc++.h>
using namespace std;
long long x,y,tam;
int main()
{
cin>>x>>y;
cout<<"x truoc khi doi la:"<<x<<endl;
cout<<"y truoc khi doi la:"<<y<<endl;
tam=x;
x=y;
y=tam;
cout<<"x sau khi doi la:"<<x<<endl;
cout<<"y sau khi doi la:"<<y;
return 0;
}