# coding:utf-8

# 一番大きな数を最初ににして
# 最後に - (小さな数)を -の数だけやる

S = str(input())
num = []
p = 0
m = 0
for i in S:
    if i == '+':
        p += 1
    elif i == '-':
        m += 1
    else:
        num.append(i)
num = list(reversed(sorted(num)))
# print(num)
num_m = 0
for i in range(m):
    num_m += int(num.pop())
num_p = 0

for i in range(p):
    num_p += int(num.pop())
foo = ''.join(num)
# print(foo,num_p,num_m)
print(int(foo)+num_p-num_m)