Мяу

file_in = open("input.txt", "r")

file_out = open("output.txt", "w")

prev_num = None

curr_chain_len = 0

max_chain_len = 0

for num_str in file_in:

num = int(num_str.strip())

if prev_num is None or num == prev_num:

curr_chain_len += 1

else:

max_chain_len = max(max_chain_len, curr_chain_len)

curr_chain_len = 1

prev_num = num

max_chain_len = max(max_chain_len, curr_chain_len)

file_out.write(str(max_chain_len))

file_in.close()

file_out.close()