The international standard letter/number mapping for telephones is:

{A, B, C} -> 2

{D, E, F} -> 3

{G, H, I} -> 4

{J, K, L} -> 5

{M, N, O} -> 6

{P, Q, R, S} -> 7

{T, U, V} -> 8

{W, X, Y, Z} -> 9

Using Python write a function getNumber() that takes an upper case letter and returns the number according to the international standard above.

Write a test program that prompts the user to enter a phone number as a string. The input number may contain letters. The program translates a letter (uppercase or lowercase) to a digit and leaves all other characters intact.

Here are sample runs of the program:

Enter a string: 1-800-Flowers

1 -800 -3569377

Enter a string: 1800flowers

1800356937