f = open('24-j8.txt')
s = f.readline()
a=[]
for i in range(len(s)):
    if '0' <= s[i] <= '9':
        a += [int(s[i])]
k, m = 1, 1
for i in range(1, len(a)-1):
    if a[i-1] + a[i] >= 10:
        k += 1
        m = max(m, k)
    else:
        k = 1
print(m)