Source code -
#Write the thing you need to write in that letter
letter = '''Hi ,
Thank you for subscribing to Linux & Windows Tech
if you are Linux and Windows user than this channel will never fail suprising you!!
Have a great day ahead!
Thankyou,
Suhas
Date =
'''
#input the readers name and the date.
name= input("Enter your name\n")
date = input("Enter the date\n")
# now replace the values
letter = letter.replace("", name)
letter = letter.replace("", date)
#print the letter now
print(letter)