def checkio(matr):
    """
    Given the matrix NxN (4<=N<=10). Check if 4 numbers in sequence in a column or in a row or diagonally exist.
    """
    for r in matr:  # horizontal
        if checkline(r):
            return True
    for r in zip(*matr):  # vertical
        if checkline(r):
            return True
    print(matr)
    for r in range(0, len(matr)):  # diagonal
        for c in range(0, len(matr[0])):
            ret = []
            rx = r
            cx = c
            while True:
                print('r = ', str(rx))
                print('c = ', str(cx))
                ret.append(matr[rx][cx])
                rx = rx + 1
                cx = cx + 1
                if cx >= len(matr[0]) or rx >= len(matr):
                    break
            if checkline(ret):
                return True
    return False


def checkline(l):
    c = 0
    p = ''
    for x in l:
        if p == '':
            p = x
            c = 1
            continue
        if p == x:
            c += 1
            if c >= 4:
                return True
        else:
            c = 0
        p = x
    return False
    # len([x for x in l if l.count(x) == 4]) > 0


if __name__ == '__main__':
    assert checkio([
        [1, 1, 1, 1],
        [1, 2, 3, 4],
        [5, 4, 3, 1],
        [6, 1, 3, 2]
    ]) == True, "First, horizontal"
    assert checkio([
        [7, 6, 5, 7, 9],
        [8, 7, 3, 6, 5],
        [4, 0, 6, 5, 4],
        [9, 8, 4, 0, 5],
        [2, 10, 7, 2, 10]
    ]) == False, "Second"
    assert checkio([
        [10, 1, 9, 6, 4, 1],
        [2, 5, 4, 2, 2, 7],
        [2, 2, 1, 2, 6, 4],
        [3, 2, 2, 1, 0, 2],
        [7, 9, 6, 2, 5, 7],
        [7, 3, 10, 5, 6, 2]
    ]) == True, "Third"
    assert checkio([
        [6, 6, 7, 7, 7],
        [1, 7, 3, 6, 5],
        [4, 1, 2, 3, 2],
        [9, 0, 4, 0, 5],
        [2, 0, 7, 5, 10]
    ]) == False, "fourth"
    assert checkio([
        [1, 1, 1, 6, 1, 1, 1],
        [2, 5, 4, 2, 2, 7, 2],
        [2, 6, 1, 2, 6, 4, 3],
        [3, 2, 2, 1, 0, 2, 4],
        [7, 9, 6, 2, 5, 7, 5],
        [7, 3, 10, 5, 6, 2, 5],
        [7, 3, 10, 5, 6, 2, 5]
    ]) == False, "Fifth"
    assert checkio([
        [1, 1, 3, 1],
        [1, 2, 3, 4],
        [5, 4, 3, 1],
        [6, 1, 3, 2]
    ]) == True, "Six, vertircal"