#include <iostream>
#include <vector>
#include <cstdio>
#include <sstream>
#include <map>
#include <string>
#include <algorithm>
#include <queue>
#include <cmath>
#include <functional>
#include <set>
#include <ctime>
#include <random>
#include <chrono>
#include <cassert>
#include <tuple>
#include <utility>
using namespace std;

namespace {
  using Integer = long long; //__int128;
  template<class T, class S> istream& operator >> (istream& is, pair<T,S>& p){return is >> p.first >> p.second;}
  template<class T> istream& operator >> (istream& is, vector<T>& vec){for(T& val: vec) is >> val; return is;}
  template<class T> istream& operator ,  (istream& is, T& val){ return is >> val;}
  template<class T, class S> ostream& operator << (ostream& os, const pair<T,S>& p){return os << p.first << " " << p.second;}
  template<class T> ostream& operator << (ostream& os, const vector<T>& vec){for(size_t i=0; i<vec.size(); i++) os << vec[i] << (i==vec.size()-1?"":" "); return os;}
  template<class T> ostream& operator ,  (ostream& os, const T& val){ return os << " " << val;}

  template<class H> void print(const H& head){ cout << head; }
  template<class H, class ... T> void print(const H& head, const T& ... tail){ cout << head << " "; print(tail...); }
  template<class ... T> void println(const T& ... values){ print(values...); cout << endl; }

  template<class H> void eprint(const H& head){ cerr << head; }
  template<class H, class ... T> void eprint(const H& head, const T& ... tail){ cerr << head << " "; eprint(tail...); }
  template<class ... T> void eprintln(const T& ... values){ eprint(values...); cerr << endl; }

  class range{ Integer start_, end_, step_; public: struct range_iterator{ Integer val, step_; range_iterator(Integer v, Integer step) : val(v), step_(step) {} Integer operator * (){return val;} void operator ++ (){val += step_;} bool operator != (range_iterator& x){return step_ > 0 ? val < x.val : val > x.val;} }; range(Integer len) : start_(0), end_(len), step_(1) {} range(Integer start, Integer end) : start_(start), end_(end), step_(1) {} range(Integer start, Integer end, Integer step) : start_(start), end_(end), step_(step) {} range_iterator begin(){ return range_iterator(start_, step_); } range_iterator   end(){ return range_iterator(  end_, step_); } };

  inline string operator "" _s (const char* str, size_t size){ return move(string(str)); }
  constexpr Integer my_pow(Integer x, Integer k, Integer z=1){return k==0 ? z : k==1 ? z*x : (k&1) ? my_pow(x*x,k>>1,z*x) : my_pow(x*x,k>>1,z);}
  constexpr Integer my_pow_mod(Integer x, Integer k, Integer M, Integer z=1){return k==0 ? z%M : k==1 ? z*x%M : (k&1) ? my_pow_mod(x*x%M,k>>1,M,z*x%M) : my_pow_mod(x*x%M,k>>1,M,z);}
  constexpr unsigned long long operator "" _ten (unsigned long long value){ return my_pow(10,value); }

  inline int k_bit(Integer x, int k){return (x>>k)&1;} //0-indexed

  mt19937 mt(chrono::duration_cast<chrono::nanoseconds>(chrono::steady_clock::now().time_since_epoch()).count());

  template<class T> string join(const vector<T>& v, const string& sep){ stringstream ss; for(size_t i=0; i<v.size(); i++){ if(i>0) ss << sep; ss << v[i]; } return ss.str(); }

  inline string operator * (string s, int k){ string ret; while(k){ if(k&1) ret += s; s += s; k >>= 1; } return ret; }
}

long long power_mod(long long x, long long y, long long mod){
  long long ret = 1;
  while(y){
    if(y&1) ret = (ret*x) % mod;
    x = (x*x) % mod;
    y >>= 1;
  }
  return ret;
}

#include <unordered_map>

//find k such that x^k = y (mod z)
//x and z are co-prime
//x^(aH-b) = y (mod z)
//x^aH = y * x^b (mod z)
long long baby_step_giant_step(long long x, long long y, long long z){
  // static long long H = sqrt(z) + 1;
  static long long H = pow(z, 0.80) + 1;
  static long long W = z/H + 1;
  // static set<pair<int,long long>> S;
  static unordered_map<long long, long long> S;

  if(S.size()==0) for(long long i=0, w=1; i<H; i++, w=(w*x)%z){
    // S.insert({w,i});
    S[w] = i;
  }

  static unordered_map<long long, long long> memo;
  if(memo.count(y)){
    return memo[y];
  }

  long long k = -1;
  static long long x_H = power_mod(x, H, z);
  long long y_inv = power_mod(y, z-2, z);
  for(long long i=1, w=x_H * y_inv % z; i<=W; i++, w=(w*x_H)%z){
    // auto itr = S.lower_bound({w+1, 0});
    // if(itr == S.begin()) continue;

    // itr--;
    // if(itr->first == w){
    //   return H * i - itr->second;
    // }

    if( S.count(w) ){
      return memo[y] = H*i - S[w];
    }
  }

  return memo[y] = k;
}

int main(){
  long long p,r;
  cin >> p,r;
  long long q;
  cin >> q;
  for(int i=0; i<q; i++){
    long long a,b,c;
    // cin >> a,b,c;
    scanf("%lld%lld%lld", &a,&b,&c);

    long long a2_inv = my_pow_mod(2*a%p, p-2, p);
    long long b_ = (p-b) % p;

    long long d = (b*b%p - 4*a%p*c%p) % p;
    if( d<0 ) d += p;

    if( d==0 ){
      long long x = b_ * a2_inv % p;
      println(x);
      continue;
    }

    long long w = baby_step_giant_step(r,d, p);
    if( w%2 != 0 ){
      println(-1);
      continue;
    }

    long long xa = (b_ + my_pow_mod(r, w/2, p)) * a2_inv % p;
    long long xb = (b_ - my_pow_mod(r, w/2, p) + p) * a2_inv % p;

    if(xa!=xb) println( min(xa,xb), max(xa,xb) );
    else println(xa);
  }

  return 0;
}