#include <cs50.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>

int main(int argc, string argv[])

{
    if (argc != 2 || isdigit (argv[1]))
    {
        printf ("./caesar key\n");
        return 1;
    }

      printf ("success\n");

      printf ("%s\n", argv[1]);

    return 0;
}