#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  string s;
  cin >> s;
  int cnt1 = 0, cnt2 = 0;
  rep(i, s.size()) {
    if (s[i] == 'c')
      cnt1++;
    else
      break;
  }
  for (int i = s.size() - 1; i >= 0; --i) {
    if (s[i] == 'w')
      cnt2++;
    else
      break;
  }
  cout << min(cnt1 - 1, cnt2) << endl;
  return 0;
}