with open('puzzle.txt', 'r') as f:
    strings = f.read().splitlines()

nice_strings = 0

def second_method(even_pairs, odd_pairs):
    for index_even, even_pair in enumerate(even_pairs):
        for index_odd, odd_pair in enumerate(odd_pairs):
            if even_pair == odd_pair and index_odd != index_even and index_even != index_odd + 1:
                return True
    return False

for string in strings:
    string_list = list(string)
    for character_idx in range(len(string_list) - 2):
        if string_list[character_idx] == string_list[character_idx + 2]:
            even_pairs = []
            odd_pairs = []
            for character_idx_b in range(len(string_list) - 1):
                if character_idx_b % 2 == 0:
                    even_pairs.append(f'{string_list[character_idx_b]}{string_list[character_idx_b + 1]}')
                else:
                    odd_pairs.append(f'{string_list[character_idx_b]}{string_list[character_idx_b + 1]}')

            if len(even_pairs) != len(set(even_pairs)) or len(odd_pairs) != len(set(odd_pairs)):
                nice_strings += 1
                print(nice_strings, "First method")
                break

            else:
                if second_method(even_pairs, odd_pairs):
                    nice_strings += 1
                    print(nice_strings, "Second method", string)
                    break


print(nice_strings)