C++ :

#include<iostream>
using namespace std;
int main()
{
	int a,b,c;
	cin>>a>>b;
	  c=a;
	  a=b;
	  b=c;
	cout<<a<<" "<<b;
	return 0;
}

Pascal :

var
a,s,d:integer;
begin
read(a,s);
d:=a;
a:=s;
s:=d;
write(a,' ',s); 
end.