Vigenere

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

 int main ( int argc, string argv[]){

   string theKey = "";


     while (argc != 2){

         printf("You just need to type in a word!");


       if (argv[1]) {

         int i = strlen(argv[1]);

         for (int k = 0; k < i; k++){

             if (isdigit(argv[1][i])){

                 printf("No number should be within the word you typed!\n");

                 return 1;

             }  else {


             theKey = argv[1];

             break;
    }

         }


     }

 }

 printf("The key is %s\n", theKey);

 }