#include <bits/stdc++.h>
using namespace std;
signed main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  string s;
  cin >> s;
  long long ans = 1;
  long long n = s.size();
  for (long long i = 1; i < n; i++) {
    if (s[i] != s[i - 1]) {
      ans++;
    }
  }
  cout << ans + 1;
  return 0;
}
