import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.List;

public class Main implements Runnable {

	FastReader in = new FastReader();
	int h, w;
	char[][] field;
	int[][] pattern = new int[][] { { 0, 1 }, { 0, -1 }, { 1, 0 }, { -1, 0 } };
	
	public void run() {
		while (read()) {
			solve();
		}
	}

	public static void main(String[] args) {
		// try {
		new Thread(null, new Main(), "", 32 * 1024 * 1024).start();
		// } catch (InterruptedException e) {
		// e.printStackTrace();
		// }
	}

	public void solve() {
		int res = 0;
		for (int x = 0; x < h; x++) {
			for (int y = 0; y <w; y++) {
				if (field[x][y] != '.') {
					dfs(x, y, field[x][y]);
					res++;
				}
			}
		}
		System.out.println(res);
	}

	public boolean read() {
		h = in.nextInt();
		w = in.nextInt();
		if (h == 0 && w == 0) {
			return false;
		}

		field = in.nextCharArray2D(h, w);
		return true;
	}

	public void dfs(int x, int y, char target) {
		field[x][y] = '.';
		for (int i = 0; i < 4; i++) {
			int dx = x + pattern[i][0];
			int dy = y + pattern[i][1];
			if (dx >= 0 && dx < h && dy >= 0 && dy < w) {
				if (field[dx][dy] == target) {
					dfs(dx, dy, target);
				}
			}
		}
	}
}

class FastReader {
	private InputStream in = System.in;
	private byte[] buf = new byte[1024];
	private int charNum;
	private int charLen;
	private StringBuilder sb = new StringBuilder();

	public int read() {
		if (charLen == -1)
			throw new InputMismatchException();
		if (charNum >= charLen) {
			charNum = 0;
			try {
				charLen = in.read(buf);
			} catch (IOException e) {
				throw new InputMismatchException();
			}
			if (charLen <= 0)
				return -1;
		}
		return buf[charNum++];
	}

	public String next() {
		int c = read();
		while (isWhitespace(c)) {
			c = read();
		}
		sb.setLength(0);
		do {
			sb.appendCodePoint(c);
			c = read();
		} while (!isWhitespace(c));
		return sb.toString();
	}

	public char[] nextCharArray() {
		return next().toCharArray();
	}

	public char[][] nextCharArray2D(int h, int w) {
		char[][] array = new char[h][w];
		for (int i = 0; i < h; i++) {
			array[i] = nextCharArray();
		}
		return array;
	}

	public int nextInt() {
		return (int) nextLong();
	}

	public int[] nextIntArray(int n) {
		int[] array = new int[n];
		for (int i = 0; i < n; i++)
			array[i] = nextInt();
		return array;
	}

	public List<Integer> nextIntList(int n) {
		Integer[] array = new Integer[n];
		for (int i = 0; i < n; i++)
			array[i] = nextInt();
		return Arrays.asList(array);
	}

	public int[][] nextIntArray2D(int n, int m) {
		int[][] array = new int[n][m];
		for (int i = 0; i < n; i++)
			array[i] = nextIntArray(m);
		return array;
	}

	public List<int[]> nextIntsList(int n, int m) {
		List<int[]> list = new ArrayList<int[]>(n);
		for (int i = 0; i < n; i++)
			list.add(nextIntArray(m));
		return list;
	}

	public long nextLong() {
		int c = read();
		while (isWhitespace(c)) {
			c = read();
		}
		int sgn = 1;
		if (c == '-') {
			sgn = -1;
			c = read();
		}
		long res = 0;
		do {
			if (c < '0' || c > '9')
				throw new InputMismatchException();
			res *= 10;
			res += c - '0';
			c = read();
		} while (!isWhitespace(c));
		return res * sgn;
	}

	public double nextDouble() {
		return Double.parseDouble(next());
	}

	public double[] nextDoubleArray(int n) {
		double[] array = new double[n];
		for (int i = 0; i < n; i++)
			array[i] = nextDouble();
		return array;
	}

	public boolean isWhitespace(int c) {
		return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
	}
}

Measured memory_bytes: 25256