Make a program that converts everything you type into Leetspeak, using the following equivalence: 0 for O, 1 for I (or L), 2 for Z (or R), 3 for E, 4 for A, 5 for S, 6 for G (or B), 7 for T (or L), 8...

Make a program that converts everything you type into Leetspeak, using the following equivalence: 0 for O, 1 for I (or L), 2 for Z (or R), 3 for E, 4 for A, 5 for S, 6 for G (or B), 7 for T (or L), 8 for B, and 9 for P (or G and Q). So “Hello world!” is rendered as “H3770 w02ld!”