#include <iostream>
#include <vector>

std::vector<bool> journals;
std::vector<bool> journals_copy;

void load_data()
{
    char c;
    while(std::cin >> c)
    {
        if (c == '+') journals.push_back(0);
        if (c == '-') journals.push_back(1);

        std::cin >> c;
    }
}

/*int pile_over_to_zeros()
{
    int pile_overs = 0;

    for (int i = 0; i < journals.size(); i++)
    {
        if (journals[i] == 1)
        {
            pile_overs++;
            for (int j = i + 1; j < journals.size(); j++)
            {
                if (journals[j] == 1) i++;
            }
        }
    }

    return pile_overs;
}

int pile_over_to_ones()
{
    int pile_overs = 0;

    for (int i = 0; i < journals.size(); i++)
    {
        if (journals[i] == 0)
        {
            pile_overs++;
            journals[i] =
            for (int j = i + 1; j < journals.size(); j++)
            {
                if (journals[j] == 0) i++;
            }
        }
    }

    return pile_overs;
}*/

int pile_over()
{
    int pile_overs_result = 2147483647;

    /*for (int x = 0; x < journals.size(); x++)
    {
        std::cout << journals[x] << ' ';
    }
    std::cout << '\n';
    std::cout << '\n';*/

    for (int x = 0; x < journals.size(); x++)
    {
        journals_copy.push_back(journals[x]);
    }

    for (int result = 0; result < 2; result++)
    {
        int pile_overs = 0;

        int not_result = (result == 0) ? 1 : 0;

        //std::cout << result << ":\n";

        for (int i = 0; i < journals.size(); i++)
        {
            if (journals[i] == result)
            {
                pile_overs++;
                journals[i] = not_result;

                for (int j = i + 1; j < journals.size(); j++)
                {
                    if (journals[j] == result)
                    {
                        journals[j] = not_result;
                        i++;
                    }
                    else break;
                }

                /*for (int x = 0; x < journals.size(); x++)
                {
                    std::cout << journals[x] << ' ';
                }
                std::cout << '\n';*/
            }
        }

        //std::cout << '\n';

        if (pile_overs_result > pile_overs) pile_overs_result = pile_overs;

        for (int x = 0; x < journals.size(); x++)
        {
            journals[x] = journals_copy[x];
        }
    }

    return pile_overs_result;
}

int main()
{
    load_data();

    //int to_zeros = pile_over_to_zeros();
    //int to_ones = pile_over_to_ones();

    //std::cout << () ? to_ones : to_zeros << '\n';
    //if (to_zeros > to_ones) std::cout << to_ones << "\n";
    //else  std::cout << to_zeros << "\n";
    std::cout << pile_over() << '\n';

    return 0;
}