#include <stdio.h>
#include "arith.h"

int
main()
{ long a[2] = {0, 1};
  long b[2] = {0xffffffff, 0xffffffff};
  long c[2];

  do {
    int over = LongAdd(a, b, c);
    printf("\ra = %08lx%08lx, b = %08lx%08lx, ", a[0], a[1], b[0], b[1]);
    if (over) puts("overflow\n\r");
    else printf("a + b = %08lx%08lx\n\r", c[0], c[1]);
  } while (scanf(" %lx %lx %lx %lx", &a[0], &a[1], &b[0], &b[1]) == 4);

  return 0;
}