Python 3 code and comments please.

Alphabetic Telephone Number Translator program

Many computers use telephone number like 555- GET-FOOD so the number is easier for their customers to remember.

On a standard telephone, the alphabetic letters are mapped to numbers in the following fashion:

A,B and C = 2

D,E, and F = 3

G,H, and I = 4

J,K, and L = 5

M, N, and O = 6

P, Q, R, and S = 7

T, U, and V = 8

W, X, Y, and Z = 9

Design a program that asks the user to enter 10 character telephone in the format XXX-XXX-XXXX. The program should display the telephone number with any alphabetic characters that appeared in the original translated to numeric equivalent.

For example, if the user enter 555-GET-FOOD the program should display 555-438-3663.