#include <stdio.h>

int main()
{
  int a, b, tmp;

  a = 1;
  b = 2;
  
  printf("A: %d B: %d\n", a, b);

  tmp = a;
  a = b;
  b = tmp;

  printf("A: %d B: %d\n", a, b);

  return 0;
}