s = open('24.txt').readline()

maxi = 0

alf = ''.join(sorted('QWERTYUIOPASDFGHJKLZXCVBNM'))[:13]

for letter in alf:

maxi = max(maxi, len(max(s.split(letter)[1:-1], key=len) + letter*2))

print(maxi)

s = open('24.txt').readline().strip()

p = [[i for i in range(len(s)) if s[i] == c] for c in 'ABCDEFGHIJKLM' if s.count(c) > 1]

m = [max(x[i+1] - x[i] for i in range(len(x) - 1)) for x in p]

print(max(m) + 1)

import re

s = open('24.txt').readline().strip()

m = [max([len(x) for x in re.findall(f'{c}[^{c}]*',s)[:-1]]) for c in 'ABCDEFGHIJKLM' if s.count(c)>1]

print(max(m) + 1)

f = open('24.txt')

q = f.read()

mx = 0

w = "ABCDEFGHIJKLM"

for i in range (len(q)-1):

count = 0

if q[i] in w:

count += 1

for t in range(i+1 ,len(q)):

if q[t] == q[i]:

count += 1

mx = max(mx,count)

break

else:

count += 1

else:

continue

print(mx)

f.close()