Is the question bugged? (Extraterrestrials)

Question

I made this for the extraterrestrials problem, it looks correct, yet it says its incorrect:
-----------
#include <stdio.h>
#include <string.h>

int main() {

char wrd[50];
int x;
scanf("%s",wrd);
for (x = strlen (wrd);x >= 0; x--) {
printf ("%c",wrd[x]);
}
return 0;
}
-----------

Answer 1

x = strlen(wrd)-1

This is the first letter you want to print!

Answer 2

Arrays follow zero indexing.
char word[50] means it can store values from index 0 to 49.