#include <iostream>
#include <vector>

std::vector<bool> journals;

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

    return pile_overs;
}

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";

    return 0;
}