#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<ll> VL;
typedef vector<VL> VVL;
typedef pair<int, int> PII;

#define FOR(i, a, n) for (int i = (int)a; i < (int)n; ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(x) x.begin(), x.end()
#define MOD 1000000007
#define INF 1000000000
#define PI 3.14159265359
#define EPS 1e-12

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

  int a = 0;
  REP(i, s.size()) {
    if(s[i] != 'c') {
      a = i;
      break;
    }
  }
  if(a-1 >= s.size()-a) {
    cout << s.size()-a << endl;
  } else {
    cout << a-1 << endl;
  }

  return 0;
}