firstname = input("First name: ")
surname = input("Surname: ")
age = int(input("Age: "))
password = input("Password: ")

username = firstname[:3] + str(age)

with open("account.txt","a",newline="") as myfile:
    writer = csv.writer(myfile)
    writer.writerow([username,password,firstname,surname,age])
    myfile.close()

menu()

user0 = input("Username: ")
pass0 = input("Password: ")


file = open("account.txt","r")

for line in file:
    details = line.split(",")



if user0 == details[0] and pass0 == details[1]:
    print("Correct!")
else:
    print("Fail")


menu()

selection = int(input("1 or 2: "))

if selection == 1:
    register()
else:
    login()