JavaScript Beginner

Convert a Morse Code input String to alphabet characters. The input is made up of dots (.) and dashes (-) for the Morse Code symbols and commas (,) to separate characters and semicolons (;)to separate words. Each letter is preceded by a "T" or "E" to indicate if you should output it as Uppercase of Lowercase. Only use prompt() and document.writeln() for I/O and code as if you were a beginner trying to understand javascript