LetterExpresion

package com.company;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;

public class Main {

    public static void main(String[] args) throws IOException {

        //Split string to array
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String[] input = reader.readLine().split("[^a-z0-9]+|(?<=[a-z])(?=[0-9])|(?<=[0-9])(?=[a-z])");

        Integer count = 0;
        Integer tmp2 = 0;
        Integer tmp1 = Integer.valueOf(input[0]);
        for (int i = 0; i < input.length - 2; i +=2 ){
            tmp2 = Integer.valueOf(input[i + 2]);
            //plus
            if (input[i + 1].length() % 2 == 0) {
                count = tmp1 + tmp2;

            }//minus
            if (input[i + 1].length() % 2 != 0) {
                count = tmp1 - tmp2;
            }
            tmp1 = count;

        }
        System.out.println(count);

    }




}