text: #include <stdio.h>
  #include <math.h>
  
  void swap(int *x, int *y)
  {
      int temp = *x;
      *x = *y;
      *y = temp;
  }
  
  int main()
  {
      int x, y;
      scanf("%d %d", &x, &y);
      printf("%d %d\n", x, y);
      swap(&x, &y);
      printf("%d %d\n", x, y);
  }
  
  