#include <stdio.h>

void Troca( int a, int b ){
  int aux;
  printf ( "a e b: %d %d\n", a, b );
  aux = a;
  a = b;
  b = aux;
  printf ( "a e b: %d %d\n", a, b );
  return;
}

int main () {
  int    x;
  int    y;
  scanf ( "%d %d", &x, &y );
  printf ( "x e y: %d %d\n", x, y );
  Troca( x, y );
  printf ( "x e y: %d %d\n", x, y );
  return 0;
}