#include <cstdio>
#include <cstring>
#include <string>
#include <cmath>
#include <cassert>
#include <iostream>
#include <algorithm>
#include <stack>
#include <queue>
#include <vector>
#include <set>
#include <map>
#include <bitset>
#include <functional>
using namespace std;

#define repl(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define rep(i,n) repl(i,0,n)
#define mp(a,b) make_pair((a),(b))
#define pb(a) push_back(a)
#define all(x) (x).begin(),(x).end()
#define dbg(x) cout<<#x"="<<(x)<<endl
#define fi first
#define se second

#define INF 2147483600

int main(){
  string s;
  cin>>s;

  int t=0;
  while(s[t]=='c')t++;

  cout<<min(t-1, (int)s.size()-t)<<endl;

  return 0;
}