#include <bits/stdc++.h>
using namespace std;
template <class T>
inline T bigMod(T p, T e, T M) {
  long long int ret = 1;
  for (; e > 0; e >>= 1) {
    if (e & 1) ret = (ret * p) % M;
    p = (p * p) % M;
  }
  return (T)ret;
}
template <class T>
inline T modInverse(T a, T M) {
  return bigMod(a, M - 2, M);
}
template <class T>
inline T gcd(T a, T b) {
  if (b == 0) return a;
  return gcd(b, a % b);
}
template <class T>
inline T lcm(T a, T b) {
  a = abs(a);
  b = abs(b);
  return (a / gcd(a, b)) * b;
}
template <class T>
inline T diss(T x1, T x2, T y1, T y2) {
  return sqrt(((x1 - x2) * (x1 - x2)) + ((y1 - y2) * (y1 - y2)));
}
template <class T>
inline string int2String(T a) {
  ostringstream str;
  str << a;
  return str.str();
}
template <class T>
inline T string2int(string a) {
  stringstream str(a);
  T b;
  str >> b;
  return b;
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  ;
  char s[200000];
  cin >> s;
  int len = strlen(s), count = 0;
  for (int i = 0; i < len; i++) {
    if (i == 0) {
      count++;
      continue;
    } else {
      if (s[i] != s[i - 1])
        count++;
      else
        continue;
    }
  }
  count++;
  cout << count << endl;
  return 0;
}
