letters = 'abcdefgh'

knight_hor = param1.lower()

i = 0

if i < 10:

x = param2

i += 1

if i < 10:

x = param3

i += 1

if i < 10:

x = param4

i += 1

assert i < 10

if len(knight_hor) != 1 or not knight_hor.isalpha():

print('Horizontal input for knight is not a letter')

elif knight_hor not in letters:

print('Horizontal input for knight is not a proper letter')

else:

knight_column = param5

if not knight_column.isdigit():

print('Vertical input for knight is not a number')

else:

knight_column = knight_column

if knight_column < 1 or knight_column > 8:

print('Vertical input for knight is not a proper number')

else:

bishop_hor = param6.lower()

if len(bishop_hor) != 1 or not bishop_hor.isalpha():

print('Horizontal input for bishop is not a letter')

elif bishop_hor not in letters:

print('Horizontal input for bishop is not a proper letter')

else:

bishop_column = param7

if not bishop_column.isdigit():

print('Vertical input for bishop is not a number')

else:

bishop_column = bishop_column

if bishop_column < 1 or bishop_column > 8:

print(

'Vertical input for bishop is not a proper number'

)

else:

row_dif = abs(letters.index(knight_hor) -

letters.index(bishop_hor))

hor_dif = abs(knight_column - bishop_column)

if row_dif == 0 and hor_dif == 0:

print("They can't be in the same square")

elif row_dif != 0 and hor_dif != 0 and row_dif + hor_dif == 3:

print('Knight can attack bishop')

elif row_dif == hor_dif:

print('Bishop can attack knight')

else: