using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;

class Magatro {
    static string S = Console.ReadLine();
    static void Main() {
        int min = int.MaxValue;
        int  length = S.Length;
        for(int i = 0; i < length - 1; i++) {
            for(int j = 1; j<= length-i; j++) {
                string s = S.Substring(i, j );
                if (cww(s)) {
                    min = Math.Min(s.Length,min);
                }
            }
        }
        if (min == int.MaxValue) {
            Console.WriteLine(-1);
            return;
        }
        Console.WriteLine(min);
    }
     static bool cww(string s) {
        int q = 0;
        for(int i = 0; i < s.Length; i++) {
            if (q == 0) {
               if( s[i] == 'c') {
                    q++;
                }
            }
            if (q == 1 || q == 2) {
                if (s[i] == 'w') {
                    q++;
                }
            }            
        }
        if (q == 3) {
            return true;
        }
        else {
            return false;
        }
    }

}