C :

#include<stdio.h>
int main()
{int a,b;
scanf("%d%d",&a,&b);
a=a+b;b=a-b;a=a-b; 
printf("%d %d",a,b);
return 0;
}

C++ :

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

Pascal :

var
   a,b,c:longint;
begin
   readln(a,b);
   c:=a;a:=b;b:=c;
   writeln(a,' ',b);
end.

Python :

a , b = raw_input().split()
c = a
a = b
b = c
print a , b