#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <iostream>
#include <istream>
#include <iterator>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>
#include <tuple>
#include <iomanip>
#include <climits>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
//typedef pair<ll, ll> P;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define revrep(i, n) for(int i = (n)-1; i >= 0; i--)
#define pb push_back
#define f first
#define s second
#define chmin(x, y) x = min(x, y);
#define chmax(x, y) x = max(x, y);

//const ll INFL = LLONG_MAX;//10^18 = 2^60
const ll INFL = 1LL<<60;
//const int INF = INT_MAX;
const int INF = 1 << 30;//10^9
ll MOD = 1000000007;
//ll MOD = 998244353;
double EPS = 1e-11;

vector<ll> dy = {0, 1, 0, -1, 1, 1, -1, -1, 0};
vector<ll> dx = {1, 0, -1, 0, 1, -1, 1, -1, 0};

void pres(double A){printf("%.12lf\n", A);}
void BinarySay(ll x, ll y = 60){rep(i, y) cout << (x>>(y-1-i) & 1); cout << endl;}
ll cnt_bit(ll x){return __builtin_popcountll(x);}

ll pow_long(ll x, ll k){
  ll res = 1;
  while(k > 0){
    if(k % 2) res *= x;
    x *= x; k /= 2;
  }
  return res;
}

ll pow_mod(ll x, ll k){
  x %= MOD;
  ll res = 1;
  while(k > 0){
    if(k % 2){
      res *= x; res %= MOD;
    }
    x *= x; x %= MOD;
    k /= 2;
  }
  return res;
}

ll inverse(ll x){return pow_mod(x, MOD - 2);};

ll gcd(ll a, ll b){
    if(b == 0) return a;
    return gcd(b, a % b);
}

ll lcm(ll x, ll y){
  ll res = x / gcd(x, y);
  res *= y;
  return res;
};


//コンビネーション
const int MAXcomb = 2000010;
ll fac[MAXcomb], finv[MAXcomb], inv[MAXcomb];
//facはn!,finvは1/n!
//invは逆元
void COMinit(){
    fac[0] = fac[1] = 1;
    finv[0] = finv[1] = 1;
    inv[1] = 1;
    for(int i = 2; i < MAXcomb; i++){
        fac[i] = fac[i-1] * i % MOD;
        inv[i] = MOD - inv[MOD%i] * (MOD/i) % MOD;
        finv[i] = finv[i-1] * inv[i] % MOD;
    }
}
ll comb(int n, int k){
    if(n < k) return 0;
    if(n < 0 || k < 0) return 0;
    return fac[n] * finv[k] % MOD * finv[n-k] % MOD;
}

const int MAXkai = 200010;
ll kai_memo[MAXkai];
ll kai(ll N){
  if(kai_memo[N] != 0) return kai_memo[N];
  if(N <= 1) return 1;
  return kai_memo[N] = N * kai(N-1) % MOD;
}

ll disit(ll s, ll base = 10){
  ll res = 0;
  while(s){
    res++;
    s /= base;
  }
  return res;
}

void solve(){
  ll K, X, Y;
  cin >> K >> X >> Y;
  if(K % 2 == 0 && (X+Y)%2){
    cout << -1 << endl;
    return;
  }
  ll x = X + Y;
  ll y = X - Y;
  vector<pair<ll, ll>> ans;
  while(x != 0 || y != 0){
    ans.pb({x, y});
    bool cx = 0, cy = 0;
    bool sw = 0;
    if(x < 0){
      cx = 1;
      x *= -1;
    }
    if(y < 0){
      cy = 1;
      y *= -1;
    }
    if(x > y){
      sw = 1;
      swap(x, y);
    }
    if(x <= K && y == K){
      x = 0, y = 0;
    }else if(x == K && y <= K){
      x = 0, y = 0;
    }else if(x <= K && y <= K){
      if(y % 2 == 0) x = K, y -= K;
      else if(x % 2 == 0) x -= K, y = K;
      else x--, y -= K;
    }else if(y <= 2 * K){
      if(x % 2 == 0) x = K, y -= K;
      else if(y % 2 == 0) x -= K, y = K;
      else x--, y -= K;
    }else{
      x -= K;
      y -= K;
    }
    if(sw){
      swap(x, y);
    }
    if(cx){
      x *= -1;
    }
    if(cy){
      y *= -1;
    }
  }
  reverse(ans.begin(), ans.end());
  rep(i, ans.size()){
    ll nx = (ans[i].f + ans[i].s) / 2;
    ll ny = (ans[i].f - ans[i].s) / 2;
    ans[i] = {nx, ny};
  }
  cout << ans.size() << endl;
  rep(i, ans.size()){
    cout << ans[i].f << " " << ans[i].s << endl;
  }
}



int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  solve();
}


Measured memory_bytes: 6252