Plase define main and invoke it. Use python 3.5 **Program to Convert Text File Lines to Upper Case**Write a program that asks the user for the name of a text file, and then prints to the screen each of the lines in the file in upper case letters.**Example:**Consider a text file containing:```Input: first, get the inputProcess: then do the calculationsOutput: and last, print the results!!!```A sample run of your program would look like:```Please enter your file name: myFile.txtYour file in upper case letters is:INPUT: FIRST, GET THE INPUTPROCESS: THEN DO THE CALCULATIONSOUTPUT: AND LAST, PRINT THE RESULTS!!!```**Instructions:**For the purpose of testing your program, you will need a text file created using Notepad. Only upload your Python program; provide your own text file.

PROGRAM: #Defining main() def main(): #Getting file name as input from the user fileName = input("Please enter your file name: ") #Printing statement print("\nYour file in upper case letters is:") #Opening the file with read permission with open(fileName, 'r') as f: #Reading the file by line for line in f: #Printing the file data in upper case print(line.upper(),end='') #Closing the file f.close() #Calling the main() function if __name__== "__main__": main()SCREENSHOT OF THE PROGRAM:SCREENSHOT OF THE INPUT FILE:OUTPUT: