#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  int ans = 10000;
  string S;
  cin>>S;
  int N = S.size();
  for(int i=0;i<N;i++)for(int j=i+1;j<N;j++)for(int k=j+1;k<N;k++)if(S[i] == 'c' && S[j] == 'w' && S[k] == 'w') ans = min({ans,k-i+1});
  cout<<ans-(ans==10000)*10001<<endl;
}