In this program, we define an input to be valid if all of following conditions hold:All alphabetic letters are lower case, like c programming!,Non alphabetic letters can only be digits, white space, exclamation point, question mark, or period. Write a program that prompts the user to enter input. The program determines if the input is a valid or invalid.RequirementsName your program project$2\_$valid.c$.$Use getchar$()$ function to read in the input. Do not use scanf. Arrays are not allowed to solve this problem.The user input ends with the user pressing the enter key $($a new line character$).$Character handling library functions in ctype.h are allowed.Follow the format of the examples below.