using System; using System.Collections; using System.Collections.Generic; using System.Linq; using System.IO; class Meguru { public Meguru() { } public static int Main() { new Meguru().calc(); return 0; } Scanner cin; //今日は2問目までしか解きませんよ! void calc() { cin = new Scanner(); int start = -1; string S = cin.next(); List c = new List(); List w = new List(); for (int i = 0; i < S.Length; i++) { if (S[i] == 'c') c.Add(i); else if (S[i] == 'w') w.Add(i); } int ans = int.MaxValue; foreach (var c1 in c) { foreach (var c2 in w) { foreach (var c3 in w) { if (c1 < c2 && c2 < c3) { ans = Math.Min(ans, c3 - c1) + 1; } } } } if (ans == int.MaxValue) Console.WriteLine(-1); else Console.WriteLine(ans); } } class Scanner { string[] s; int i; char[] cs = new char[] { ' ' }; public Scanner() { s = new string[0]; i = 0; } public string next() { if (i < s.Length) return s[i++]; string st = Console.ReadLine(); while (st == "") st = Console.ReadLine(); s = st.Split(cs, StringSplitOptions.RemoveEmptyEntries); i = 0; return next(); } public int nextInt() { return int.Parse(next()); } public long nextLong() { return long.Parse(next()); } public double nextDouble() { return double.Parse(next()); } }