A little known fact about cows is the fact that they are red-green colorblind, meaning that red and green look identical to them. This makes it especially difficult to design artwork that is appealing to cows as well as humans.
Consider a square painting that is described by an N x N grid of characters (1 <= N <= 100), each one either R (red), G (green), or B (blue). A painting is interesting if it has many colored "regions" that can be distinguished from each-other. Two characters belong to the same region if they are directly adjacent (east, west, north, or south), and if they are indistinguishable in color. For example, the painting
RRRBB GGBBB BBBRR BBRRR RRRRRhas 4 regions (2 red, 1 blue, and 1 green) if viewed by a human, but only 3 regions (2 red-green, 1 blue) if viewed by a cow.
Given a painting as input, please help compute the number of regions in the painting when viewed by a human and by a cow.
입력 5 RRRBB GGBBB BBBRR BBRRR RRRRR 출력 4 3
출처: USACO 2014 March Contest, Bronze