Regexp functions in Python

Matching username requirements

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You need to write a simple program that checks whether usernames match the requirements. The only requirement is that it has to begin with a letter.

If a username starts with anything but a letter, your program should return Oops! The username has to start with a letter.
Otherwise, output Thank you!

You will get a username as input. Print a correct response.

Sample Input 1:

12user

Sample Output 1:

Oops! The username has to start with a letter.

Write a program in Python 3

import re

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