#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <stack>
#include <queue>
#include <set>
#include <cmath>
#include <map>
using namespace std;
#define MOD 1000000007
#define INF 999999999
typedef long long ll;

int tt[180][2];
int main(){
  string s;
  int c_num,w_num;
  cin>>s;
  for(int i=0;i<s.size();i++){
    if(s[i]=='c')c_num++;
    if(s[i]=='w')w_num++;
  }
  int res=min(c_num-1,w_num);
  cout<<res<<endl;
  return 0;
}