Hiding For Dear Life

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Scenario

A group of letters have escaped and are trying to disguise themselves amongst a larger group of random letters from the alphabet. The letters that have escaped are all lowercase letters hiding in a string amongst a group of capital letters.

Task

Your task is to write a function hidingWord which takes one String argument and returns a string of the hiding letters in uppercase letters.

Note: Your function only needs to work with the following input: lowercase letters, uppercase letters, and empty spaces.

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function hidingWord

The hidingWord function should accept aString argument and return a String output in capital letters.

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Sample Results

hidingWord("ALaYLEllAFINsPONtNQEaHGrPBcWToGHJdAOIeR") // --> ALLSTARCODE
hidingWord("ECAMNmSSFJoOOEFLPGoQWZXCLnADHIGY") // --> MOON
hidingWord("YFeHUmFBbeFBzYzFBYLleGBYEmFGBeMENnTt") // --> EMBEZZLEMENT
hidingWord("TNhKANBiVUQdPSHiGBVAKnOAOIQgFD") // --> HIDING
hidingWord("QCAqNLIuSJPeFAMTGHOSeTREQWCVXnADYUIP") // QUEEN
hidingWord("YUIMJHFchALJAZXCVYAQPHeASVNZAsALJFUsNAQF") // CHESS
hidingWord("PAJBNaAJFERYTAZAJPOrUAFGJALJRtALJFAVQAS") // ART
hidingWord("ACJZLwPAOFJORTEQoAJZQERYCBVMrAJAQGHFYmAQJGL") // WORM
hidingWord("") // --> ""

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Your function should work for any String argument. DO NOT HARDCODE!