You are making a new phone where people can type in specialized phone numbers, for example,
1-800-program, and they would be converted automatically to a usable phone number, like
1-800-7764726 (for the previous example).
Your program will recieve a string if any length with numbers, letters and dashes, and convert all the letters to their corresponding numbers.
Here is a keypad, for reference:
- Your program will receive a string
- It will process it and return/print another string
- Any language is accepted
- Since it is code-golf, the shortest code wins