#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
//using mint = modint1000000007;
//const int mod = 1000000007;
using mint = modint998244353;
const int mod = 998244353;
//const int INF = 1e9;
const long long LINF = 1e18;
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rep2(i,l,r)for(int i=(l);i<(r);++i)
#define rrep(i, n) for (int i = (n) - 1; i >= 0; --i)
#define rrep2(i,l,r)for(int i=(r) - 1;i>=(l);--i)
#define all(x) (x).begin(),(x).end()
#define allR(x) (x).rbegin(),(x).rend()
#define P pair<int,int>
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	long long x; cin >> x;
	if (1 == x) {
		cout << 2 << endl;
		cout << "1 2" << endl;
		cout << "b g" << endl;
		return 0;
	}
	const int LIM = 200000;
	vector<int>b;
	rep2(i, 2, LIM + 1) {
		if (0 != x % i)continue;
		int cnt = 0;
		while (0 == x % i) {
			x /= i;
			cnt++;
		}
		if (2 == i) {
			while (cnt >= 2) {
				cnt -= 2;
				b.push_back(i * 2);
			}
			if (cnt)b.push_back(i);
		}
		else {
			while (cnt) {
				cnt--;
				b.push_back(i);
			}
		}
	}
	if (1 != x || b.size() + accumulate(b.begin(), b.end(), 0) > LIM) {
		cout << -1 << endl;
		return 0;
	}
	int n = b.size() + accumulate(b.begin(), b.end(), 0);
	int now = b.size();
	cout << n << endl;
	rep(i, b.size()) cout << i + 1 << " " << i + 2 << endl;
	rep(i, b.size())rep(j, b[i])cout << i + 1 << " " << ++now << endl;
	rep(i, b.size())cout << "b" << " ";
	rep(i, n - b.size())cout << "g" << " ";
	cout << endl;
	return 0;
}