Morse Code Translator

Your task is to write a program that takes a string as input and translates it into its equivalent in international Morse code. The input will be a string of lowercase space-separated words where each word consists of nothing but the letters a-z. Add spaces between the words but not between the letters of a word in morse code. Here is the alphabet in morse code:

a: .-      g: --.     m: --      s: ...     y: -.--  
b: -...    h: ....    n: -.      t: -       z: --..  
c: -.-.    i: ..      o: ---     u: ..-     
d: -..     j: .---    p: .--.    v: ...-    
e: .       k: -.-     q: --.-    w: .--     
f: ..-.    l: .-..    r: .-.     x: -..-    

For example, the string

lorem ipsum

should be translated to

.-..---.-..-- ...--......---