Problem
You are given a large body of text, and you are asked to determine the frequency with which each letter of the alphabet starts a word in the text, using MapReduce.
For example, given the text, "East Lothian is a county to the East of Edinburgh. It is one of thirty-two council areas of Scotland." the output would be: "(a,2), (c,2), (e,3), (i,3), (l,1), (o,3), (s,1), (t,3)".
Describe what the input and output of both the Map and Reduce functions would look like and explain briefly what each function does.