#include <bits/stdc++.h> using namespace std; #define REP(i,n) for(int i=0; i<int(n); i++) #define FOR(i,m,n) for(int i=int(m); i<int(n); i++) #define ALL(obj) (obj).begin(),(obj).end() #define VI vector<int> #define VLL vector<long long> #define VVI vector<vector<int>> #define VVLL vector<vector<long long>> #define VC vector<char> #define VS vector<string> #define VVC vector<vector<char>> #define fore(i,a) for(auto &i:a) typedef long long ll; typedef pair <int, int> P; template<class T> bool chmax(T &a, T b) { if (a < b) { a = b; return true; } return false; } template<class T> bool chmin(T &a, T b) { if (a > b) { a = b; return true; } return false; } const int INF = 2147483647; const ll INFL = 9223372036854775807; const ll mod = 1000000007; int main() { string s; cin >> s; VI c, w; REP(i, s.size()) { if (s[i] == 'c')c.push_back(i); else if (s[i] == 'w')w.push_back(i); } int ans = INF; REP(i, c.size()) { bool a = true; REP(j, w.size()) { if (c[i] < w[j]) { if (a)a = false; else ans = min(ans, w[j] - c[i] + 1); } } } if (ans == INF)cout << -1 << endl; else cout << ans << endl; return 0; }