# temp

name = input("Please enter your name: ")
birth = input("Please enter your birthday(ex: 20200310): ")
phone = input("Please enter your cell phone: ")
alist = list(birth)
blist = list(phone)

while len(alist) != 8 or not birth.isdigit():
    birth = input("Enter again: ")

while len(blist) != 11 or not phone.isdigit():
    phone = input("Enter again: ")

not birth.isdigit()

T F