#include <ctype.h>

int palindrome(const char *str, unsigned len) {
  const char *start = str;
  const char *end = str + len - 1;

  while(start < end) {
    if(!isalpha(*start)) {
      start += 1;
    } else if(!isalpha(*end)) {
      end -= 1;
    } else if(tolower(*start) == tolower(*end)) {
      start += 1;
      end -= 1;
    } else {
      return 0;
    }
  }

  return 1;
}

#include <string.h>

int main(int argc, char **argv) {
  if(argc < 2) {
    return 2;
  }

  return !palindrome(argv[1], strlen(argv[1]));
}