#include<bits/stdc++.h>

#define REP(i,s,n) for(int i=s;i<n;++i)
#define rep(i,n) REP(i,0,n)

using namespace std;

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