# -*- coding:utf-8 -*-

class Solution:

def StrToInt(self, s):

# write code here

flag = False

if s==None or len(s)<1:

return 0

numstack = []

dict = {'0': 0, "1": 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9}

for i in s :

if i in dict.keys():

numstack.append(dict[i])

elif '+' == i:

continue

elif '-' == i:

continue

else:

return 0

if 1 == len(s) and '0'==s[0]:

flag =True

return 0

ans = 0

if 1== len(s) and ('+'==s[0] or '-'==s[0]):

return 0

for i in numstack:

ans = ans*10 + i

if '-' == s[0]:

ans = 0-ans

return ans

s=Solution()

print s.StrToInt('-111')

print s.StrToInt('+')

print s.StrToInt('0')

print s.StrToInt('')