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# (.NET Core 3.1.201) (judge verdict: Accepted)

using Yorukatsu050.Questions;
using Yorukatsu050.Extensions;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace Yorukatsu050.Questions
{
    /// <summary>
    /// https://atcoder.jp/contests/abc161/tasks/abc161_e
    /// </summary>
    public class QuestionF : AtCoderQuestionBase
    {
        public override IEnumerable<object> Solve(TextReader inputStream)
        {
            var nkc = inputStream.ReadIntArray();
            var totalDaysCount = nkc[0];
            var workDaysCount = nkc[1];
            var interval = nkc[2];
            var plan = inputStream.ReadLine();

            var earliestWorkdays = GetEarliestWorkdays(plan, workDaysCount, interval);
            var latestWorkdays = GetLatestWorkdays(plan, workDaysCount, interval);

            var outputLines = 0;
            for (int workCount = 0; workCount < earliestWorkdays.Length; workCount++)
            {
                if (earliestWorkdays[workCount] == latestWorkdays[workCount])
                {
                    yield return earliestWorkdays[workCount] + 1;
                    outputLines++;
                }
            }
            if (outputLines == 0)
            {
                yield return string.Empty;
            }
        }

        int[] GetEarliestWorkdays(string plan, int workDaysCount, int requiredInterval)
        {
            var earliestWorkDays = new int[workDaysCount];
            var day = 0;
            var interval = 1 << 25;
            for (int workDay = 0; workDay < earliestWorkDays.Length; workDay++)
            {
                while (plan[day] == 'x' || interval <= requiredInterval)
                {
                    day++;
                    interval++;
                }
                earliestWorkDays[workDay] = day++;
                interval = 1;
            }
            return earliestWorkDays;
        }

        int[] GetLatestWorkdays(string plan, int workDaysCount, int requiredInterval)
        {
            var latestWorkDays = new int[workDaysCount];
            var day = plan.Length - 1;
            var interval = 1 << 25;
            for (int workDay = latestWorkDays.Length - 1; workDay >= 0; workDay--)
            {
                while (plan[day] == 'x' || interval <= requiredInterval)
                {
                    day--;
                    interval++;
                }
                latestWorkDays[workDay] = day--;
                interval = 1;
            }
            return latestWorkDays;
        }

    }
}


namespace Yorukatsu050
{
    class Program
    {
        static void Main(string[] args)
        {
            IAtCoderQuestion question = new QuestionF();    // 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);
            }
        }
    }
}

#region Base Classes

namespace Yorukatsu050.Questions
{

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

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

            return Solve(reader);
        }

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

}

#endregion

#region Extensions

namespace Yorukatsu050.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