#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)

int main(){
    int ans = 1000;
    bool can = false;
    string chiwawa;
    cin >> chiwawa;
    int size = chiwawa.size();
    
    vector<int> ccnt;
    vector<int> wcnt;
    for(int i=0;i<size;i++){
        if(chiwawa[i] == 'c') ccnt.push_back(i);
        else if(chiwawa[i] == 'w') wcnt.push_back(i);
    }
    
    int csize = ccnt.size();
    int wsize = wcnt.size();
    
    rep(i,csize){
        rep(j,wsize){
            for(int k = j + 1; k < wsize; k++){
              cout << ccnt[i] << " " << wcnt[j] << " " << wcnt[k] << endl;
                if(ccnt[i] < wcnt[j]){
                    ans = min(ans, wcnt[k]-ccnt[i]+1);
                    can = true;
                }
            }
        }
    }
    if(!can) ans = -1;
    
    cout << ans << endl;
}