A is for Alpha, B is for Bravo, C is for Charlie, D is for Delta, E is for Echo, F is for Foxtrot, G is for Golf, H is for Hotel, I is for India, J is for Juliet, K is for Kilo, L is for Lima, M is for Mike, N is for November, O is for Oscar, P is for Papa, Q is for Quebec, R is for Romeo, S is for Sierra, T is for Tango, U is for Uniform, V is for Victor, W is for Whiskey, X is for X-ray, Y is for Yankee, and Z is for Zulu.
Converting letters to numbers results in a list with each letter in a string changed to its position in the alphabet.
Ever since mobile phones became the new normal, phone books have fallen by the wayside, and few people have any phone numbers beyond their own memorized anymore.