using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        private const string CWW = "c.*?w.*?w";

        static void Main(string[] args)
        {
            var target = Console.ReadLine();
            var regex = new Regex(CWW);

            var index = 0;
            var roopEnd = false;
            var result = -1;

            do
            {
                var match = regex.Match(target, index);

                if (match.Success)
                {
                    index = match.Index + 1;
                    var tmp = match.Value.Length;
                    result = (result == -1) ? tmp : Math.Min(result, tmp);
                }
                else
                {
                    roopEnd = true;
                }

            } while (roopEnd == false);

            Console.WriteLine(result);

            Console.ReadKey();
        }
    }
}