import string
import copy
def building_seats(row, seats):
    seats_list = []
    row_list = []
    alpha_list = []
    alpha_list = [chr(x) for x in range(ord('A'), ord('Z') + 1)]
    for s in alpha_list[0:seats]:
        seats_list.append(s)
    str_seats = ' '.join(seats_list)
    for i in range(1, row + 1):
        row_list.append(i)
        print(i, str_seats)
    seats_list = [seats_list]*seats
    reservering_seat(seats_list, row)

def reservering_seat(seats_list, row):
    row2, reserved_seat = input("Input seat number (row seat): ").split()
    row3 = int(row2)
    seats_list_copy = copy.deepcopy(seats_list)
    for index, value in enumerate(seats_list_copy[row3]):
        if value == reserved_seat:
            seats_list_copy[[row3][index]].remove(value)
            seats_list_copy[[row3][index]].insert(index, "X")
            print(seats_list_copy)
    printing_updated_seats(seats_list_copy, row)

def printing_updated_seats(seats_list_copy, row):
    fixed_list = [val for sublist in seats_list_copy for val in sublist]
    fixed_list = list(dict.fromkeys(fixed_list))
    str_seats = ' '.join(fixed_list)
    for i in range(1, row + 1):
        print(i, str_seats)





def main():
   row = int(input("Enter number of rows: "))
   seats = int(input("Enter a number of seats in each row: "))
   building_seats(row, seats)
main ()