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 Rust (1.15.1) (judge verdict: Accepted)

// This code is generated by [cargo-atcoder](https://github.com/tanakh/cargo-atcoder)
// Original source code:
/*
use io::*;
use std::*;

fn solve(N: i64, K: i64, C: i64, S: Vec<u8>) {
    let mut before: Vec<(usize, Option<usize>)> = Vec::new();
    let mut cooldown = 0;
    let mut acc = 0;
    let mut last = None;
    for (i, x) in S.iter().cloned().enumerate() {
        before.push((acc, last));
        if x == b'o' && cooldown == 0 {
            acc += 1;
            cooldown = C;
            last = Some(i);
        } else if cooldown > 0 {
            cooldown -= 1;
        }
    }
    let mut after: Vec<usize> = Vec::new();
    let mut cooldown = 0;
    let mut acc = 0;
    for x in S.iter().rev().cloned() {
        if x == b'o' && cooldown == 0 {
            acc += 1;
            cooldown = C;
        } else if cooldown > 0 {
            cooldown -= 1;
        }
        after.push(acc);
    }
    after.reverse();
    for i in 0..N as usize {
        if S[i] == b'o' {
            let (bef, last) = before[i];
            let idx = if let Some(last) = last {
                cmp::max(last + C as usize + 1, i+1)
            } else {
                i + 1
            };
            let aft = if idx < N as usize { after[idx] } else { 0 };
            if bef + aft < K as usize {
                println!("{}", i + 1);
            }
        }
    }
    println!();
}

// Generated by 1.1.6 https://github.com/kyuridenamida/atcoder-tools
fn main() {
    let con = read_string();
    let mut scanner = Scanner::new(&con);
    let mut N: i64;
    N = scanner.next();
    let mut K: i64;
    K = scanner.next();
    let mut C: i64;
    C = scanner.next();
    let mut S: String;
    S = scanner.next();
    solve(N, K, C, S.into_bytes());
}

pub mod io {
    use std;
    use std::str::FromStr;

    pub struct Scanner<'a> {
        iter: std::str::SplitWhitespace<'a>,
    }

    impl<'a> Scanner<'a> {
        pub fn new(s: &'a str) -> Scanner<'a> {
            Scanner {
                iter: s.split_whitespace(),
            }
        }

        pub fn next<T: FromStr>(&mut self) -> T {
            let s = self.iter.next().unwrap();
            if let Ok(v) = s.parse::<T>() {
                v
            } else {
                panic!("Parse error")
            }
        }

        pub fn next_vec_len<T: FromStr>(&mut self) -> Vec<T> {
            let n: usize = self.next();
            self.next_vec(n)
        }

        pub fn next_vec<T: FromStr>(&mut self, n: usize) -> Vec<T> {
            (0..n).map(|_| self.next()).collect()
        }
    }

    pub fn read_string() -> String {
        use std::io::Read;

        let mut s = String::new();
        std::io::stdin().read_to_string(&mut s).unwrap();
        s
    }
}
*/

fn main() {
    let exe = "/tmp/binCE5BF964";
    std::io::Write::write_all(&mut std::fs::File::create(exe).unwrap(), &decode(BIN)).unwrap();
    std::fs::set_permissions(exe, std::os::unix::fs::PermissionsExt::from_mode(0o755)).unwrap();
    std::process::exit(std::process::Command::new(exe).status().unwrap().code().unwrap())
}

fn decode(v: &str) -> Vec<u8> {
    let mut ret = vec![];
    let mut buf = 0;
    let mut tbl = vec![64; 256];
    for i in 0..64 { tbl[TBL[i] as usize] = i as u8; }
    for (i, c) in v.bytes().filter_map(|c| { let c = tbl[c as usize]; if c < 64 { Some(c) } else { None } }).enumerate() {
        match i % 4 {
            0 => buf = c << 2,
            1 => { ret.push(buf | c >> 4); buf = c << 4; }
            2 => { ret.push(buf | c >> 2); buf = c << 6; }
            3 => ret.push(buf | c),
            _ => unreachable!(),
        }
    }
    ret
}

const TBL: &'static [u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
const BIN: &'static str = "<base64-encoded ELF executable removed>";