#include <bits/stdc++.h>
using namespace std;

void fast_io() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
}

int main() {
	fast_io();
	long long x;
	cin >> x;
	if (x == 1) {
		cout << "2\n1 2\nb g\n";
		return 0;
	}
	const int M = 200000;
	vector<int> pf;
	for (int i = 2; i <= M; i++) {
		while (x % i == 0) {
			pf.push_back(i);
			x /= i;
		}
	}
	if (x > 1) {
		cout << -1 << endl;
		return 0;
	}
	vector<pair<int, int>> ans;
	vector<char> color;
	int n = 0;
	int r_prev = 0;
	for (int i = 0; i < pf.size(); i++) {
		if (n) {
			ans.push_back({r_prev, n});
		}
		int r = n++;
		color.push_back('b');
		int cnt = pf[i];
		if (i + 1 < pf.size() && pf[i] == 2 && pf[i + 1] == 2) {
			cnt = 4;
			i++;
		}
		for (int j = 0; j < cnt; j++) {
			ans.push_back({r, n++});
			color.push_back('g');
		}
		r_prev = r;
	}
	if (n > M) {
		cout << -1 << endl;
		return 0;
	}
	cout << n << endl;
	for (auto [u, v] : ans) {
		cout << u + 1 << " " << v + 1 << endl;
	}
	for (int i = 0; i < n; i++) {
		cout << color[i] << " ";
	}
	cout << endl;
}