Код с разбора демо

# Задача 17 способ 1
tf = open('17.txt')
maxi = float('-inf')
count = 0
prev_x = int(tf.readline())
for x in tf:
    x = int(x)
    pair = prev_x + x
    if prev_x % 3 == 0 or x % 3 == 0:
        count += 1
        maxi = max(pair, maxi)
    prev_x = x
print(count, maxi)

# Задача 17 способ 2
a = [int(x) for x in open('17.txt')]
count = 0
maxi = -100000
for i in range(1, len(a)):
    if a[i - 1] % 3 == 0 or a[i] % 3 == 0:
        count += 1
        maxi = max([a[i - 1], a[i], maxi])
print(count, maxi)

# Задача 24
tf = open('24.txt')
s = tf.readline()
res = s[0]
maxi = float('-inf')
for i in range(1, len(s)):
    if s[i - 1] + s[i] != 'PP':
        res += s[i]
        maxi = max(maxi, len(res))
    else:
        res = s[i]
print(maxi)