#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int INF = (int)1e9 + 1001010;
const ll llINF = (long long)4e18 + 22000020;
const string endn = "\n";
template <class T> inline auto vector2(size_t i, size_t j, const T &init = T()) {
    return vector(i, vector<T>(j, init));
}
const string ELM_SEP = " ", VEC_SEP = endn;
template <class T> istream &operator>>(istream &i, vector<T> &A) {
    for(auto &I : A) { i >> I; }
    return i;
}
template <class T> ostream &operator<<(ostream &o, const vector<T> &A) {
    int i = A.size();
    for(const auto &I : A) { o << I << (--i ? ELM_SEP : ""); }
    return o;
}
template <class T> ostream &operator<<(ostream &o, const vector<vector<T>> &A) {
    int i = A.size();
    for(const auto &I : A) { o << I << (--i ? VEC_SEP : ""); }
    return o;
}
template <class T> vector<T> &operator++(vector<T> &A, int) {
    for(auto &I : A) { I++; }
    return A;
}
template <class T> vector<T> &operator--(vector<T> &A, int) {
    for(auto &I : A) { I--; }
    return A;
}
template <class T, class U> bool chmax(T &a, const U &b) { return ((a < b) ? (a = b, true) : false); }
template <class T, class U> bool chmin(T &a, const U &b) { return ((a > b) ? (a = b, true) : false); }
ll floor(ll a, ll b) {
    if(b < 0) a = -a, b = -b;
    return (a >= 0) ? a / b : (a + 1) / b - 1;
}
ll ceil(ll a, ll b) {
    if(b < 0) a = -a, b = -b;
    return (a > 0) ? (a - 1) / b + 1 : a / b;
}
ll bit(unsigned long long val, unsigned long long digit) { return (val >> digit) & 1; }
#ifdef DEBUG
#include <cpp-dump/dump.hpp>
#define dump(...) cpp_dump(__VA_ARGS__)
namespace cp = cpp_dump;
struct InitCppDump {
    InitCppDump() {
        if(!isatty(fileno(stderr))) CPP_DUMP_SET_OPTION(es_style, cpp_dump::es_style_t::no_es);
        CPP_DUMP_SET_OPTION(log_label_func, cp::log_label::line());
        CPP_DUMP_SET_OPTION(max_iteration_count, 30);
    }
} init_cpp_dump;
#else
#define dump(...)
#endif
// ==================== ここまでテンプレ ====================


int main(int argc, char *argv[]){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    ll x; cin >> x;
    if(x == 1){
        cout << 2 << endl;
        cout << 1 << " " << 2 << endl;
        cout << "b g" << endl;
        return 0;
    }

    vector<ll> pfs;
    const ll MAX = (ll)2e5;
    {
        vector<ll> cand;
        for(int i = 3; i <= MAX; i++) cand.push_back(i);
        cand.push_back(2);
        for(auto i : cand){
            if(x % i == 0){
                pfs.push_back(i);
                while(x % i == 0) x /= i;
            }
        }
    }
    if(x > 1){
        cout << -1 << endl;
        return 0;
    }

    dump(pfs);

    vector<pair<ll, ll>> edges;
    vector<char> color;
    ll last_brown;
    for(int i = 0; i < pfs.size(); i++){
        ll pf = pfs[i];
        if(i > 0) edges.emplace_back(last_brown, color.size());
        last_brown = color.size();
        color.push_back('b');

        for(int j = 0; j < pf; j++){
            edges.emplace_back(last_brown, color.size());
            color.push_back('g');
        }
    }

    if(color.size() > MAX){
        cout << -1 << endl;
        return 0;
    }

    cout << color.size() << endl;
    for(auto [u, v] : edges){
        cout << u+1 << " " << v+1 << endl;
    }
    cout << color << endl;
    return 0;
}