$3\mathrm{.}9$ LAB: Warm up: Text message abbreviation decoder

$(1)$ Write a program that prompts a user to enter an abbreviation. If the user's input string matches a known text message abbreviation, output the unabbreviated form, else output: Unknown. Support two abbreviations: LOL $-$ laughing out loud, and IDK $--$ I don't know. $(4$ pts$)$

If the input is: