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.Collections.Generic;
using System;

public class Hello
{
    public static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var n = int.Parse(line[0]);
        var k = int.Parse(line[1]);
        var c = int.Parse(line[2]);
        var s = Console.ReadLine().Trim();
        var R = getR(n, k, c, s);
        getAns(n, k, c, s, R);
    }
    static int[] getR(int n, int k, int c, string s)
    {
        var a = new int[k + 1];
        var p = n - 1;
        var kc = k;
        while (p >= 0 && kc >= 1)
        {
            if (s[p] == 'o')
            {
                a[kc--] = p + 1;
                p -= c + 1;
            }
            else p--;
        }
        return a;
    }
    static void getAns(int n, int k, int c, string s, int[] R)
    {
        var ans = new List<int>();
        var p = 0;
        var kc = 1;
        while (p < n && kc <= k)
        {
            if (s[p] == 'o')
            {
                if (R[kc] == p + 1) ans.Add(p + 1);
                p += c + 1;
                kc++;
            }
            else p++;
        }
        Console.WriteLine(string.Join("\n", ans));
    }
}