uses crt;
var x,y:integer;
begin
readln(x,y);
writeln(x,' ',y);
wrieln(y,' ',x);
readln;
end.
#include <bits/stdc++.h>
using namespace std;
int main()
{
long long a,c,tam,x,y;
cin>>x>>y;
a=x;
c=y;
cout<<"a truoc khi doi la:"<<a<<endl;
cout<<"c truoc khi doi la:"<<c<<endl;
tam=a;
a=c;
c=tam;
cout<<"a sau khi doi la:"<<a<<endl;
cout<<"c sau khi doi la:"<<c<<endl;
return 0;
}