knights_tour_stage1

# Write your code here
def get_dimension():
    try:
        print("Enter the knight's starting position:")
        x = input()
        if [z.isdigit() for z in x]:
            x = x.split()
            # print(x)
            x = [int(i) for i in x]
            # print(x)
            if len(x) == 2:
                if 0 < x[0] < 9 and 0 < x[1] < 9:
                    print_board(x[0], x[1])
                else:
                    raise ValueError
            else:
                raise ValueError
        else:
            raise ValueError
    except ValueError:
        print('Invalid dimensions!')


def print_board(m, n):
    print('  -------------------')
    r = 8
    c = 8 + 3
    mat = [['_' for x in range(c)] for y in range(r)]
    for y in range(r):
        mat[y][0] = r - y
        mat[y][1] = '|'
        mat[y][c - 1] = '|'

    mat[8 - n][m - 1 + 2] = 'X'
    for i in range(r):
        for j in range(c):
            print(mat[i][j], end=" ")
        print()
    print('  -------------------\n   1 2 3 4 5 6 7 8')




get_dimension()