Your company is writing a spell-checker system, and you have been tasked with writing a function to determine how closely two words resemble each other. The algorithm you are to use, albeit not a very good one, is to compare the two words character by character, and count how many times the characters in a given position are the same. For instance, the words "TICK" and "TOCK" have a score of 3, since three characters (T, C, K) are the same. Similarly, "CAT" and "DOG" score 0, since no letters match.
You are given Strings a and b and are to return an int indicating the score (as defined above) of how closely the two match.