def is_compleate(res):
  if res.startswith("-"):
    res = res[::-1]
  while res.startswith("+-"):
    res = res[2:]
  
  return res == ''


inp = input()

if inp.startswith("-"):
  inp = inp[::-1]

flip = 0

while not is_compleate(inp):
  i = inp.find('++') + 1
  j = inp.find('--') + 1
  if i > j:
    i, j = j, i
 
  inp = inp[:i] + inp[i:j][::-1] + inp[j:]
  flip += 1

print(flip)