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 Python (3.4.3) (judge verdict: Wrong Answer)

import math
import random
import sys

sys.setrecursionlimit(10**7)
MAX_INT = 2**62-1
def input() -> str:
    return sys.stdin.readline()

def main():
    n, k, c = map(int, input().split())
    s = input().strip()
    front = set()
    start = 0
    days = k
    while start < n and days:
        if s[start] == 'x':
            start += 1
        else:
            front.add(start)
            days -= 1
            start += c + 1
    # print(front)
    # if len(front) > k:
    #     return

    back = set()
    start = n-1
    days = k
    while start >= 0 and days:
        if s[start] == 'x':
            start -= 1
        else:
            back.add(start)
            days -= 1
            start -= c + 1
    # print(back)
    for i in front & back:
        print(i+1)

if __name__ == "__main__":
    main()