diff = {'+': '-', '-': '+'}


def main():
  pattern = input()

  res = 0
  prev = '.'
  otacam = 0
  for i in pattern:
    if prev == '.':
      prev = i
      continue    

    if otacam:
      if prev == i:
        prev = diff[i]

      else:
        prev = i
        otacam = 0
 
    else:
      if prev == i:
        prev = diff[i]
        otacam = 1
        res += 1

      else:
        prev = i

  print(res)

if __name__ == '__main__':
  main()