#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

#define RREP(i,s,e) for (i = e-1; i >= s; i--)
#define rrep(i,n) RREP(i,0,n)
#define REP(i,s,e) for (i = s; i < e; i++)
#define rep(i,n) REP(i,0,n)
#define INF 1e8

typedef long long ll;

int main() {
    int c, cw, cww, ans;
    string s;
    cin >> s;
    c = cw = cww = ans = -1;
    for (auto x : s) {
        if (x == 'c')
            c = 1;
        else if (x == 'w') {
            cww = (cw > 0) ? cw + 1 : cww;
            cw = (c > 0) ? c + 1 : cw;
            ans = (cww > 0) ? min(ans,cww) : ans;
        }
        else {
            c = (c > 0) ? c + 1 : c;
            cw = (cw > 0) ? cw + 1 : cw;
            cww = (cww > 0) ? cww + 1 : cww;
        }
    }
    cout << ans << endl;
    return 0;
}