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: Time Limit Exceeded)

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

namespace ConsoleTest
{
    static partial class Program
    {

        static bool EnableWork(bool[] yotei, int k, int c)
        {
            var debug = new List<int>();
            int day = 0;
            int ok = 0;
            do
            {
                while (!yotei[day])
                {
                    day++;
                    if (day == yotei.Length) return false;
                }
                //debug.Add(day);
                //Console.WriteLine(day);

                ++day;
                ++ok;
                day += c;
                if (ok == k) return true;
                if (day >= yotei.Length) return false;
            } while (true);
        }
        static bool Test(bool[] yotei, int k, int c)            
        {
            for(int i =0;i<yotei.Length;++i)
            {
                if (!yotei[i]) continue;
                yotei[i] = false;
                if(!EnableWork(yotei,k,c))
                {
                    //Console.WriteLine(string.Format("day [{0}] is needed", i));
                    Console.WriteLine(i+1);
                }
                yotei[i] = true;
            }
            return true;
        }
        static bool[] FromString(string s)
        {
            var sLen = s.Length;
            var yotei = new bool[sLen];
            for (int i = 0; i < sLen; ++i)
            {
                yotei[i] = s[i] == 'o' ? true : false;
            }
            return yotei;
        }
        static void Main(string[] args)
        {
            var v = Ints();
            int n = v[0];
            int k = v[1];
            int c = v[2];
            string s = Console.ReadLine();
            Test(FromString(s), k, c);
            //var yotei = FronString(s);
            //Test(FromString("ooxxxoxxxoo"), 3, 2);
            //Console.WriteLine(EnableWork(FromString("ooxxxoxxxoo"), 3, 2));
        }

    }
    static partial class Program
    {
        public static int Int()
        {
            return int.Parse(Console.ReadLine());
        }
        public static int[] Ints()
        {
            return Console.ReadLine().Split(' ').Select(s => int.Parse(s)).ToArray();
        }
        public static long[] Longs()
        {
            return Console.ReadLine().Split(' ').Select(s => long.Parse(s)).ToArray();
        }
        public static int[][] MultiInts(int num)
        {
            var result = new int[num][];
            for(int i = 0; i < num; ++i)
            {
                result[i] = Ints();
            }
            return result;
        }
        public static T[] MultiItems<T>(int num, Func<string,T> parser)
        {
            var result = new T[num];
            for(int i =0; i < num; ++i)
            {
                result[i] = parser(Console.ReadLine());
            }
            return result;
        }
    }
}