#include <bits/stdc++.h>
using namespace std;
#include <atcoder/modint>
using namespace atcoder;
#ifdef DEFINED_ONLY_IN_LOCAL
#include <dump.hpp>
#define dump(...) cpp_dump(__VA_ARGS__)
#else
#undef dump
#define dump(...)
#endif
#define rep(i, n) for (int i = 0; i < n; i++)
template <class T> istream& operator>>(istream& I, vector<T>& V) { for (T& X : V) I >> X; return I; }

int main() {
    long x;
    cin >> x;
    if (x == 1) {
        cout << 2 << endl;
        cout << 1 << " " << 2 << endl;
        cout << "b g" << endl;
        return 0;
    }
    vector<int> b;
    while (x > 1) {
        bool find = false;
        for (int i = 2; i <= 2e5; i++) {
            if (x % i == 0) {
                find = true;
                b.push_back(i);
                x /= i;
                break;
            }
        }
        if (!find) {
            cout << -1 << endl;
            return 0;
        }
    }
    cout << reduce(b.begin(), b.end()) + b.size() << endl;
    for (int i = 0; i < b.size() - 1; i++) {
        cout << i << " " << i + 1 << endl;
    }
    int idx = b.size();
    rep(i, b.size()) {
        rep(j, b[i]) {
            cout << i << " " << idx++ << endl;
        }
    }
    rep(i, b.size()) cout << "b ";
    rep(i, reduce(b.begin(), b.end())) cout << "g ";
    cout << endl;
    return 0;
}