Limit Alphabetic Characters in phyton 3 then Loop

Question

how to type Alphabet only in input. then loop. example.

while 1:
a = input("Name")
if (a)<("abcdefghijklmnopqrstuvwxyz"):break
else:
print("invalid")

or

import re

while 1:
a= input("Name")
if not re.match("^[A-Za-z]

Answer 1

Look at this
https://code.sololearn.com/cHHryFgycp4U/?ref=app