#include <iostream>
#include <vector>
#include <string>
#include <sstream>
#include <queue>

using namespace std;

class ColoredStrokes{
public:
	int getLeast(vector <string> picture) {
		int h = picture.size(), w = picture[0].size();
		bool blue[50][50];
		bool red[50][50];
		memset(blue, false, sizeof(blue));
		memset(red, false, sizeof(red));
		int res = 0;
		for(int i=0;i<h;i++){
			for(int j=0;j<w;j++){
				if(picture[i][j]=='B'||picture[i][j]=='G'){
					if(!blue[i][j]){
						int ii = i;
						while(ii<h&&(picture[ii][j]=='B'||picture[ii][j]=='G')){
							blue[ii][j] = true;
							ii++;
						}
						res++;
					}
				}
				if(picture[i][j]=='R'||picture[i][j]=='G'){
					if(!red[i][j]){
						int jj = j;
						while(jj<w&&(picture[i][jj]=='R'||picture[i][jj]=='G')){
							red[i][jj] = true;
							jj++;
						}
						res++;
					}
				}
			}
		}
		return res;
	}
};