#include <stdio.h>

typedef unsigned long int ul;
ul to_int(char *);

int main(int argc, char *argv[]) {
  (argc >= 3) ? printf("%ld + %ld = %ld\n", to_int(argv[1]), to_int(argv[2]),
				to_int(argv[1])+to_int(argv[2])) :
		printf("%s: a1 a2\n", argv[0]);

  return 0;
}

ul to_int(char *s) {
  ul c;

  for (c=0; *s; s++)
    c = (*s >= 48 && *s <= 57) ? (c*10) + ((*s)-48) : c;

  return c;
}