line = input()

last = 'x'

plus = 0
minus = 0

plus_total = 0
minus_total = 0

for char in line:
    plus_total += last == '+'
    minus_total += last == '-'
    if char == last:
        plus += last == '+'
        minus += last == '-'
    last = char

moves = max(plus, minus)

moves += line[0] == line[-1] and ((line[0] == '+' and plus>minus) or (line[0] == '-' and plus<minus))

print(moves)