#include <bits/stdc++.h>
using namespace std;
int main() {
  string s;
  cin >> s;
  int n = s.size();
  int cnt = 0;
  for (int i = 0; i < n; i++) {
    if (s[i] != s[i + 1]) cnt++;
  }
  cout << cnt + 1 << endl;
}
