If a 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. (3 pts)

Sample input/output:

Input an abbreviation: LOL laughing out loud 

(2) Expand to also decode these abbreviations. (4 pts)

• BFF -- best friends forever
• IMHO -- in my humble opinion
• TMI -- too much information