areas_in_matrix_dfs

rows = int(input())
cols = int(input())

matrix = [list(input()) for _ in range(rows)]
visited = [[False] * cols for _ in range(rows)]


def dfs(parent, row, col, matrix, visited):
    if row < 0 or col < 0 or row >= len(matrix) or col >= len(matrix[0]):
        return
    if visited[row][col]:
        return
    if matrix[row][col] != parent:
        return

    visited[row][col] = True
    dfs(parent, row - 1, col, matrix, visited)
    dfs(parent, row + 1, col, matrix, visited)
    dfs(parent, row, col + 1, matrix, visited)
    dfs(parent, row, col - 1, matrix, visited)


area = {}
total_areas = 0
for r in range(rows):
    for c in range(cols):
        if visited[r][c]:
            continue
        key = matrix[r][c]
        dfs(key, r, c, matrix, visited)
        if key not in area:
            area[key] = 0
        area[key] += 1
        total_areas += 1

print(f'Areas: {total_areas}')
for letter, count in sorted(area.items()):
    print(f"Letter '{letter}' -> {count}")