def read_pgm(pgmf):
    pgmf.readline()
    pgmf.readline()
    (width, height) = [int(i) for i in pgmf.readline().split(' ')]
    pgmf.readline()
    img = []
    for y in range(height):
        row = []
        for y in range(width):
            row.append(ord(pgmf.read(1)))
        img.append(row)
    return img