Problem:
Score : 500 points

Problem Statement

Takahashi has decided to work on K days of his choice from the N days starting with tomorrow.

You are given an integer C and a string S. Takahashi will choose his workdays as follows:

After working for a day, he will refrain from working on the subsequent C days.

If the i-th character of S is x, he will not work on Day i, where Day 1 is tomorrow, Day 2 is the day after tomorrow, and so on.

Find all days on which Takahashi is bound to work.

Constraints

1 \leq N \leq 2 \times 10^5

1 \leq K \leq N

0 \leq C \leq N

The length of S is N.

Each character of S is o or x.

Takahashi can choose his workdays so that the conditions in Problem Statement are satisfied.

Input

Input is given from Standard Input in the following format:

N K C
S

Output

Print all days on which Takahashi is bound to work in ascending order, one per line.

Sample Input 1

11 3 2
ooxxxoxxxoo

Sample Output 1

6

Takahashi is going to work on 3 days out of the 11 days. After working for a day, he will refrain from working on the subsequent 2 days.

There are four possible choices for his workdays: Day 1,6,10, Day 1,6,11, Day 2,6,10, and Day 2,6,11.

Thus, he is bound to work on Day 6.

Sample Input 2

5 2 3
ooxoo

Sample Output 2

1
5

There is only one possible choice for his workdays: Day 1,5.

Sample Input 3

5 1 0
ooooo

Sample Output 3

There may be no days on which he is bound to work.

Sample Input 4

16 4 3
ooxxoxoxxxoxoxxo

Sample Output 4

11
16

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Threading.Tasks;
using AtCoderBeginnerContest161.Questions;
using AtCoderBeginnerContest161.Extensions;

namespace AtCoderBeginnerContest161.Questions
{
    public class QuestionE_Review : AtCoderQuestionBase
    {
        public override IEnumerable<string> Solve(TextReader inputStream)
        {
            var nkc = inputStream.ReadIntArray();
            var n = nkc[0];
            var k = nkc[1];
            var c = nkc[2];
            var s = inputStream.ReadLine();
            var isHolyday = s.Select(ch => ch == 'x').ToArray();

            var early = new int[k];
            var late = new int[k];

            int workdayCount = 0;
            int previous = -(c + 1);
            for (int day = 0; day < n; day++)
            {
                if (!isHolyday[day] && day - previous > c)
                {
                    early[workdayCount++] = day;
                    previous = day;
                }

                if (workdayCount >= k)
                {
                    break;
                }
            }

            workdayCount = k - 1;
            previous = n + c;

            for (int day = n - 1; day >= 0; day--)
            {
                if (!isHolyday[day] && previous - day > c)
                {
                    late[workdayCount--] = day;
                    previous = day;
                }

                if (workdayCount < 0)
                {
                    break;
                }
            }

            for (int workDay = 0; workDay < early.Length; workDay++)
            {
                if (early[workDay] == late[workDay])
                {
                    yield return (early[workDay] + 1).ToString();
                }
            }
        }
    }
}

namespace AtCoderBeginnerContest161
{
    class Program
    {
        static void Main(string[] args)
        {
            IAtCoderQuestion question = new QuestionE_Review();    // 問題に合わせて書き換え
            var answers = question.Solve(Console.In);
            foreach (var answer in answers)
            {
                Console.WriteLine(answer);
            }
        }
    }
}

namespace AtCoderBeginnerContest161.Questions
{
    // ここにQuestionクラスをコピペ


    #region Base Classes

    public interface IAtCoderQuestion
    {
        IEnumerable<string> Solve(string input);
        IEnumerable<string> Solve(TextReader inputStream);
    }

    public abstract class AtCoderQuestionBase : IAtCoderQuestion
    {
        public IEnumerable<string> Solve(string input)
        {
            var stream = new MemoryStream(Encoding.Unicode.GetBytes(input));
            var reader = new StreamReader(stream, Encoding.Unicode);

            return Solve(reader);
        }

        public abstract IEnumerable<string> Solve(TextReader inputStream);
    }

    #endregion
}

#region Extensions

namespace AtCoderBeginnerContest161.Extensions
{
    internal static class TextReaderExtensions
    {
        internal static int ReadInt(this TextReader reader) => int.Parse(ReadString(reader));
        internal static long ReadLong(this TextReader reader) => long.Parse(ReadString(reader));
        internal static double ReadDouble(this TextReader reader) => double.Parse(ReadString(reader));
        internal static string ReadString(this TextReader reader) => reader.ReadLine();

        internal static int[] ReadIntArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(int.Parse).ToArray();
        internal static long[] ReadLongArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(long.Parse).ToArray();
        internal static double[] ReadDoubleArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(double.Parse).ToArray();
        internal static string[] ReadStringArray(this TextReader reader, char separator = ' ') => reader.ReadLine().Split(separator);
    }
}

#endregion