import sys sample = list(sys.stdin.readline().rstrip('\n')) count = 0 plus = [] minus = [] started = False i=0 last = None for s in sample: if last == s and not started: i=2 started = True elif last == s and started: i+=1 elif started: if last == '+': plus.append(i) else: minus.append(i) started = False i = 0 last = s if started: if last == '+': plus.append(i) else: minus.append(i) started = False i = 0 sum_plus,sum_minus = 0,0 for x in plus: sum_plus += x-1 for x in minus: sum_minus += x-1 if sum_minus > sum_plus: print(sum_minus) else: print(sum_plus)