#include<iostream>
#include<string>

using namespace std;
int main() {

	string s;

	while ( cin >> s ) {


	int a ,b ;
	a=b=0;
	for (int i = 1; i < s.size() ; ++i) {
		if (s[i-1] == s[i]) {
			if (s[i] == '-' )
				++a;
			else ++b;

		}
	}

	cout << max(a,b) << endl;

	}

	return 0;

}