#include "bits/stdc++.h"
using namespace std;
#define fastcin {\
    cin.tie(0);\
    ios::sync_with_stdio(false);\
}
#define rep(i, a, b) for(int i = a; i < b; i++)
#define rrep(i, a, b) for(int i = a; i >= b; i--)
#define fore(i, a) for(auto &i:a)
#define print(x) cout << x << "\n"
#define SORT(a, n) sort(a, a+n);
#define REVERSE(a,n) reverse(a,a+n);
#define VSORT(v) sort(v.begin(), v.end());
#define VREVERSE(v) reverse(v.begin(), v.end());
#define MOD 1000000007
#define yes "YES"
#define no "NO"
using ll = long long;
using vi = vector<int>;
using vvi = vector<vi>;
using vll = vector<ll>;

int main() {
    fastcin;
    string s;
    cin >> s;
    int ans = 101, count = 0, countw = 0, len = s.length();
    rep(i, 0, len) {
        if(s[i]=='c') {
            rep(j, i, len) {
                count++;
                if(s[j]=='w') {
                    countw++;
                    if(countw==2) {
                        ans = min(ans, count);
                        break;
                    }
                }
            }
            count = 0;
            countw = 0;
        }
    }
    if(ans==101) ans = -1;
    print(ans);
    return 0;
}