#include <bits/stdc++.h>

using namespace std;
using ll = long long;

vector<bool> prime;

void erat(ll N){
    prime.resize(N+1, 1);
    prime[0] = 0;
    prime[1] = 0;
    for (ll i=2; i*i<=N; i++){
        if (prime[i]){
            for (ll j=i*2; j <= N; j+=i){
                prime[j] = 0;
            }
        }
    }
}

int main(){
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);

    /*
       4は2*2に分解しない方がいい
       6以上は分解した方がいい。
    */

    ll X, N=2e5, ng=0, nb=0, x, y;
    cin >> X;
    if (X == 1){
        cout << 2 << endl;
        cout << 1 << " " << 2 << endl;
        cout << 'b' << " " << 'g' << endl;
        return 0;
    }
    vector<ll> v; //茶色の頂点の番号
    map<ll, ll> mp;
    erat(N);
    for (int i=2; i<=N; i++){
        if (!prime[i]) continue;
        while(X % i == 0){
            X /= i;
            mp[i]++;
        }
    }

    if (X > N){
        cout << -1 << endl;
        return 0;
    }

    x = mp[2];
    y = x/2;
    //4がy個
    for (int i=0; i<y; i++){
        nb++;
        v.push_back(ng+nb);
        ng += 4;
    }
    if (x % 2 == 1){
        nb++;
        v.push_back(ng+nb);
        ng += 2;
    }
    for (auto [x, y] : mp){
        if (x == 2) continue;
        for (int i=0; i<y; i++){
            nb++;
            v.push_back(ng+nb);
            ng += x;
        }
    }
    v.push_back(nb+ng+1);
    if (nb+ng > N){
        cout << -1 << endl;
        return 0;
    }

    cout << nb+ng << endl;
    for (int i=0; i<v.size()-1; i++){
        for (int j=v[i]+1; j<=v[i+1]-1; j++){
            cout << v[i] << " " << j << endl;
        }
    }
    for (int i=0; i<v.size()-1; i++){
        cout << "b ";
        for (int j=v[i]+1; j<=v[i+1]-1; j++){
            cout << (i == v.size()-2 && j == v[i+1]-1 ? "g" : "g ");
        }
    }
    cout << endl;

    return 0;
}