#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <crypt.h>

int main(int argc, char *argv[]) {
  char clear[32], enc[120], *ptr;
  fgets(&clear, 32, stdin);
  if (!(ptr = strchr(&clear, '\n')))
    return 1;
  else
    *ptr = '\0';
  fgets(&enc, 120, stdin);
  if (!(ptr = strchr(&enc, '\n')))
    return 1;
  else
    *ptr = '\0';
  ptr = crypt(clear, enc);
  if (!strcmp(argv[argc - 1], "-s")) {
    /* Option -s for "show": output the encrypted version. */
    printf("%s\n", ptr);
    return 0;
  }
  /* Otherwise this is a check. */
  else if (!strcmp(ptr, enc))
    return 0;
  return 1;
}