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

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            var target = Console.ReadLine();
            var regex = new Regex("c.*?w.*?w");

            var index = 0;
            var result = -1;

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

                if(match.Success == false) { break; }

                index = match.Index + 1;
                var tmp = match.Value.Length;
                result = (result == -1) ? tmp : Math.Min(result, tmp);
            }

            Console.WriteLine(result);

            Console.ReadKey();
        }
    }
}