Write a program in C that takes 3 CLI arguments (A, B, and C) and creates 15 POSIX threads. These threads each are responsible for generating A random characters between B and C and keeping count of the frequency of letters. These threads are also responsible for writing the characters into files named chars0.txt, chars1.txt... as well. When these threads are done, the main thread must print the results on the screen.

Sample Run $ ./program1 1000 d t

Thread 0 59 65 61 72 . . . (d=59, e=65. . .)

Thread 1 69 78 65 56 . . . . . .

Thread 13 55 67 71 64 . . .

Thread 14 70 68 61 49 . . .