C++ :

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

Pascal :

var
  a,b:integer;
begin
  readln(a,b);
  writeln(b,' ',a);
end.