#include <iostream>
#include<bits/stdc++.h>

char revert(char &i);

using namespace std;
int main() {
    string journals;
    int changesCount = 0;
    char previousSign = '1';
    bool isBreak = false;
    cin >> journals;
    for (int i = 0; i < journals.size(); i++) {
        if (isBreak)
            break;
        if (journals[i] == previousSign) {
            previousSign = revert(journals[i]);
            if (i == journals.size()-1) {
                changesCount++;
                break;
            }
            for (int j = i+1; j < journals.size(); j++) {
                if(revert(journals[j]) == previousSign || journals.size() == j+1) {
                    if (journals.size() == j+1)
                        isBreak = true;
                    changesCount++;
                    i = j-1;
                    break;
                }
                previousSign = revert(journals[j]);
            }
            } else {
            previousSign = journals[i];
        }
    }
    cout<<changesCount<<endl;
    return 0;
}

char revert(char &reverted) {
    return reverted == '+' ? '-' : '+';
}