for(int i = 0; i < my_string.length(); ++i)
    {
        if(my_string.charAt(i) == '+' || my_string.charAt(i) == '-')
        {
            cost += my_string.charAt(i);
            index = i;
        }
    }
    
    for(int i = 0; i < index; ++i)
    {
        if(my_string.charAt(i) != ' ')
        {
            num1 += my_string.charAt(i);
        }
    }
    
    for(int i = index+1; i < my_string.length(); ++i)
    {
        if(my_string.charAt(i) != ' ')
        {
            num2 += my_string.charAt(i);
        }
    }
    
    System.out.println(Integer.parseInt(num1) + " " + num2);
    
    if(cost == "+")
    {
        answer = Integer.parseInt(num1) + Integer.parseInt(num2);
    }
    else
    {
        answer = Integer.parseInt(num1) - Integer.parseInt(num2);
    }
    return answer;
}