OCaml question help!

A pangram is a sentence that contains all the letters of the English alphabet at least once. For example, the quick brown fox jumps over the lazy dog is a pangram. The program you are to write must read in an input file (input. txt - a plain text file which contains 5 sentences), line by line and check if the line read is a pangram or not. If the sentence read is a pangram, it writes true to the output file. If it is not, it writes false to the output file.

Create a pangram function that takes in two strings as arguments: the first for the name of input file and second for the name of output file. The function must adhere to the following type signature: string * string -> unit. This should be written in the language oCaml

Skeleton code **

let pangram ( (inFile : string), (outFile : string) ) : unit =