#[allow(unused_imports)]
use std::cmp::*;
#[allow(unused_imports)]
use std::collections::*;
use std::io::Read;
#[allow(dead_code)]
fn getline() -> String {
    let mut ret = String::new();
    std::io::stdin().read_line(&mut ret).ok().unwrap();
    ret
}
fn get_word() -> String {
    let mut stdin = std::io::stdin();
    let mut u8b: [u8; 1] = [0];
    loop {
        let mut buf: Vec<u8> = Vec::with_capacity(16);
        loop {
            let res = stdin.read(&mut u8b);
            if res.unwrap_or(0) == 0 || u8b[0] <= b' ' {
                break;
            } else {
                buf.push(u8b[0]);
            }
        }
        if buf.len() >= 1 {
            let ret = String::from_utf8(buf).unwrap();
            return ret;
        }
    }
}

#[allow(dead_code)]
fn get<T: std::str::FromStr>() -> T { get_word().parse().ok().unwrap() }
/**
 * p is prime
 */
fn modsqrt(mut a: i64, p: i64) -> Option<i64> {
    a %= p;
    if a == 0 {
        return Some(0);
    }
    if p == 2 {
        return Some(a);
    }
    if powmod(a, (p - 1) / 2, p) != 1 {
        return None;
    }
    let mut b = 1;
    while powmod(b, (p - 1) / 2, p) == 1 {
        b += 1;
    }
    let mut e = 0;
    let mut m = p - 1;
    while m % 2 == 0 {
        m /= 2;
        e += 1;
    }
    let mut x = powmod(a, (m - 1) / 2, p);
    let mut y = a * (x * x % p) % p;
    x = x * a % p;
    let mut z = powmod(b, m, p);
    while y != 1 {
        let mut j = 0;
        let mut t = y;
        while t != 1 {
            j += 1;
            t = t * t % p;
        }
        assert!(j < e);
        z = powmod(z, 1 << (e - j - 1), p);
        x = x * z % p;
        z = z * z % p;
        y = y * z % p;
        e = j;
    }
    Some(x)
}
fn powmod(x: i64, mut e: i64, m: i64) -> i64 {
    let mut sum = 1;
    let mut cur = x % m;
    while e > 0 {
        if e % 2 != 0 {
            sum = sum * cur % m;
        }
        cur = cur * cur % m;
        e /= 2;
    }
    sum
}


fn solve() {
    let p: i64 = get();
    let r: i64 = get();
    let q = get();
    for _ in 0 .. q {
        let a: i64 = get();
        let b: i64 = get();
        let c: i64 = get();
        let b = b * powmod(a, p - 2, p) % p;
        let c = c * powmod(a, p - 2, p) % p;
        let ss = modsqrt((b * b + (2 * p - 4) * c) % p, p);
        match ss {
            Some(ss) => {
                let mut hs = Vec::new();
                hs.push(((2 * p - b - ss) % p) * powmod(2, p - 2, p) % p);
                hs.push(((p - b + ss) % p) * powmod(2, p - 2, p) % p);
                hs.sort();
                if hs[0] == hs[1] {
                    println!("{}", hs[0]);
                } else {
                    println!("{} {}", hs[0], hs[1]);
                }
            },
            None => {
                println!("-1");
            },
        }
    }
}

fn main() {
    // In order to avoid potential stack overflow, spawn a new thread.
    let stack_size = 104_857_600; // 100 MB
    let thd = std::thread::Builder::new().stack_size(stack_size);
    thd.spawn(|| solve()).unwrap().join().unwrap();
}