//#include <monsterenergy>
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
const int MAX = 1e9;
const int MIN = -1*1e9;
const ll MAXLL = 1e18;
const ll MINLL = -1*1e18;

int main()
{
    ll X,Count=0; cin >> X;
    if(X == 1)
    {
    	cout << 2 << endl;
    	cout << 1 << " " << 2 << endl;
    	cout << "b g" << endl; 
    	return 0;
    }
    if(X == 4)
    {
    	cout << 5 << endl;
    	cout << 1 << " " << 2 << endl;
    	cout << 1 << " " << 3 << endl;
    	cout << 1 << " " << 4 << endl;
    	cout << 1 << " " << 5 << endl;
    	cout << "b g g g g" << endl; 
    	return 0;
    }
    vector<int> Ans;
    for(ll i = 2; i <= 100; i++)
    {
        int c = 0;
        while(X%i == 0)
        {
            c++;
            X/=i;
            Ans.push_back(i);
        }
        Count += (i+1)*c;
    }
    if(X != 1 || 200000 < Count)
    {
        cout << -1 << endl;
        return 0;
    }
    vector<string> Color(Count+1);
    cout << Count << endl;
    int used = 1, save = -1;
    for(int i = 0; i < Ans.size(); i++)
    {
        Color[used] = "b";
        for(int j = 1; j <= Ans[i]; j++)
        {
            cout << used << " " << used+j << endl;
            Color[used+j] = "g";
        }
        if(save != -1) cout << save << " " << used << endl;
        save = used;
        used += Ans[i]+1;
    }
    for(int i = 1; i <= Count; i++)
    {
        cout << Color[i] << " ";
    }
    cout << endl;
    return 0;
}