#include<iostream>

using namespace std;

int main()
{
    bool start;
    bool previous;
    bool next;
    char in;
    int out = 0;


    cin >> in;
    if(in == '+') start = 1;
    else start = 0;
    previous = start;

    while(cin >> in)
    {
        if(in == '+') next = 1;
        else next = 0;
        if((previous != next) && (start == next))
        {
            out++;
        }
        previous = next;
        cin >> in;
    }
    cout << out << endl;

    return 0;
}