input = "0043-00334+5000"

digits={"1","2","3","4","5","6","7","8","9","0"}
operators={"+", "-"}

def parse(input):

  currentInt = ""
  tokens = []

  for i in range(0, len(input)):

    char = input[i]

    if char in digits:
      currentInt += char

    if char in operators:
      tokens.append(currentInt)
      tokens.append(char)
      currentInt = ""

    if(i == len(input)-1): #take care of the last digits since there's no operator after it
        tokens.append(currentInt)

  return tokens

def popFirst(results):
    token = results[0]
    del results[0]
    return token

def execute(results):

    total = int(popFirst(results))
    while(len(results) > 0):

        operator = popFirst(results)
        nextInt = int(popFirst(results))

        if operator == "+":
            total += nextInt
        if operator == "-":
            total -= nextInt

    return total


print(input)
result = parse(input)
print(result)
print(execute(result))