#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n);i++)
#define sz(x) int(x.size())
typedef long long ll;
typedef pair<int,int> P;

int main(){
  string s;
  cin >> s;
  map<char,int> mp;
  rep(i,sz(s)) mp[s[i]]++;
  cout << min(mp['c']-1,mp['w']) << endl;
  return 0;
}