Replacing all letters in a string apart from the first letter in each word

[Carbonix]

Hey,
I am coding a song guessing game and at the moment i have succeeded. But i have a problem. When the code starts and allows the user to guess the song, it shows the user what the full name of the song is.
For example:

def main():
    playerScore=0
    guessCounter = 0
    # This is where you can change the max turns and guesses
    maxTurns=999999999
    maxGuesses = 2
    while True:
        randNum = int(random.randint(0, 19))
        f=open('Songs.txt')
        linesa=f.read().splitlines()
        g=open('Artists.txt')
        linesb=g.read().splitlines()

        for turnCounter in range(maxTurns):
            randNum = int(random.randint(0, 19))
            f=open('Songs.txt')
            linesa=f.read().splitlines()
            g=open('Artists.txt')
            linesb=g.read().splitlines()

            # Pick a random song:
            print('==============================================')
            randsong =(linesa[randNum])
            randart =(linesb[randNum])
            print(randsong)
            print(randart)
            print('==============================================')
            # Prompt for a guess:
            songGuess = input("What is the song called?\n==============================================\n>> ")

This code would output a random song from a text file but it would out put it like this:

==============================================
Ruin My Life
by Zara Larsson
==============================================
What is the song called?
==============================================
but i would like it to look like this:

==============================================
R___ M_ L___
by Zara Larsson
==============================================
What is the song called?
==============================================

How do i do this exactly?


(If you need the full code then here is the pastebin link: https://pastebin.com/6mzLnfaK)