import time
    score = 0

    print("Welcome to the quiz!")
    time.sleep(1)
    print("In order to play, you have to register an account.")
    time.sleep(1)
    name = str(input("Please enter your full name: "))
    time.sleep(1) # Validates password
    for 8 characters long.
    while True:
        password = input("Please enter your account password(at least 8 characters): ")
    if len(password) < 8:
        print("Make sure your password is at least 8 letters.")
    else :
        print("Password is fine.")
    break

    # Age validation for 11 and over only
    age = int(input("Please enter your age: "))
    if (age < 11):
        print("You have to be 11 or over to play the quiz.")
    exit()
    else :
        print("Your age is fine.")

    YGrp = int(input("What year group are you in?(number only): "))

    # Creates a username using first 3 letters of the full name and the user 's age.
    username = name[: 3] + str(age)
    filename = username + ".txt" # Details are stored in an external text file; Username, password, age and year group.
    file = open(filename, 'w')
    file.write("Username: " + username)
    file.write("nPassword: " + password)
    file.write("nAge: " + str(age))
    file.write("nYear Group: " + str(YGrp))
    file.close()

    # Easy questions in an external file
    file = open("easyquestions.txt", 'w')
    file.write("What does CPU stand for?")
    file.write("na. Central Processor Unit")
    file.write("nb. Central Processing Unit")
    file.close()