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 Go (1.6) (judge verdict: Time Limit Exceeded)

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

// input scanner
var sc = bufio.NewScanner(os.Stdin)

const (
	initialBufSize = 10e4
	maxBufSize     = 10e6
)

func next() string {
	sc.Scan()
	return sc.Text()
}

func nextInt() int {
	a, _ := strconv.Atoi(next())
	return a
}

func nextInt64() int64 {
	a, _ := strconv.ParseInt(next(), 10, 64)
	return a
}

func nextFloat64() float64 {
	a, _ := strconv.ParseFloat(next(), 64)
	return a
}

func nextInts(n int) []int {
	ret := make([]int, n)
	for i := 0; i < n; i++ {
		ret[i] = nextInt()
	}
	return ret
}
func nextFloats(n int) []float64 {
	ret := make([]float64, n)
	for i := 0; i < n; i++ {
		ret[i] = nextFloat64()
	}
	return ret
}
func nextStrings(n int) []string {
	ret := make([]string, n)
	for i := 0; i < n; i++ {
		ret[i] = next()
	}
	return ret
}

// util
func max(l []int) (int, int) {
	idx := 0
	ans := l[idx]
	for i, n := range l {
		if n > ans {
			idx = i
			ans = n
		}
	}
	return idx, ans
}

func min(l []int) (int, int) {
	idx := 0
	ans := l[idx]
	for i, n := range l {
		if n < ans {
			idx = i
			ans = n
		}
	}
	return idx, ans
}

func check(a []int, x int, k int, c int) bool {
	ax := a[x]
	a[x] = 0
	var count int
	for i := 0; i < len(a); i++ {
		if a[i] == 1 {
			count++
			i += c
		}
		if count >= k {
			a[x] = ax
			return true
		}
	}
	a[x] = ax
	return false
}

// main
func main() {
	buf := make([]byte, initialBufSize)
	sc.Buffer(buf, maxBufSize)
	sc.Split(bufio.ScanWords)
	n := nextInt()
	k := nextInt()
	c := nextInt()
	s := next()
	a := make([]int, n)
	for i := 0; i < n; i++ {
		if s[i] == 'o' {
			a[i] = 1
		}
	}
	ans := make([]string, 0, n)
	for i := 0; i < n; i++ {
		if !check(a, i, k, c) {
			ans = append(ans, strconv.Itoa(i+1))
		}
	}
	if len(ans) > 0 {
		fmt.Println(strings.Join(ans, "\n"))
	}
}