use proconio::{
    input,
    marker::{Chars, Usize1},
};

// https://maguro.dev/blog/debug-macro/
#[allow(unused_macros)]
macro_rules! debug {
    ($($a:expr),* $(,)*) => {
        #[cfg(debug_assertions)]
        eprintln!(concat!($("| ", stringify!($a), " = {:?} "),*, "|"), $(&$a),*);
    };
}

fn main() {
    input! {
        n: usize, q: usize,
        s: Chars,
    }

    let mut csum = vec![vec![0; 26]; n + 1];
    for i in 0..n {
        for j in 0..26 {
            csum[i + 1][j] += csum[i][j];
        }

        csum[i + 1][(s[i] as u8 - b'a') as usize] += 1;
    }

    for _ in 0..q {
        input! {
            l: Usize1, r: usize, x: usize
        }

        let mut chars = vec![0; 26];
        for i in 0..26 {
            chars[i] = csum[r][i] - csum[l][i];
        }

        debug!(chars, s[l..r]);
        let mut cnt = 0;
        for i in 0..26 {
            cnt += chars[i];
            if x <= cnt {
                println!("{}", (b'a' + i as u8) as char);
                break;
            }
        }
    }
}