C programming. How to find only lowercase letters

The program needs to read a paragraph. Store only alphabetic characters(no numbers, punctuation, or spaces). Which I think I got so far.

But then I need to make a separate array that stores ONLY lowercase letters.

Also, how do I convert the characters in the array into integers?

#include #include #include

#define MAX 10000

int main() { FILE *inputFile = fopen("sample.txt", "r"); char ch[10000];

while ((ch[MAX] = fgetc(inputFile)) != EOF) {

if (isalpha(ch[MAX])) { printf("%c", ch[10000]); }

}

fclose(inputFile);

return 0;

}