import sys
import numpy as np


def main():
    a = np.frombuffer(sys.stdin.buffer.read(), 'S1').reshape(-1, 4)[:, :3] == b'#'
    b = np.array([
        [0, 1, 0],
        [1, 0, 1],
        [0, 1, 0]
    ], np.bool_)
    print('Yes' if np.array_equal(a, b) or np.array_equal(~a, b) else 'No')


if __name__ == '__main__':
    main()