24

with open("24.txt") as file:
  s = file.readline().strip()
  n = len(s)

  cur = mx = 1
  for i in range(1, n):
    if (s[i] == "d" and s[i-1] == "a") or (s[i] == "a" and s[i-1] == "d"):
      cur = 1
    else:
      cur += 1
    mx = max(mx, cur)
  print(mx)