#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
int main()
{
    string s;
    cin>>s;
    unsigned res=-1;
    for(int i=0;i<s.size();++i) {
        if (s[i]=='c') {
            int cnt=0;
            for(int j=i+1;j<s.size();++j) {
                if (s[j]=='w') ++cnt;
                if (cnt==2) res=min(res, j-i+1u);
            }
        }
    }
    cout<<(int)res<<endl;
}