(Count the letters in a string) Write a function that counts the number of letters in a C-string using the following header:
int countLetters(const char s[])
Write a test program that reads a C-string and displays the number of letters in the string. Here is a sample run of the program:

We need at least 10 more requests to produce the solution.
0 / 10 have requested this problem solution
The more requests, the faster the answer.