#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    ll x;
    cin >> x;
    vector<int> vs;
    if(x==1) {
        cout << 2 << endl;
        cout << 1 << " " << 2 << endl;
        cout << 'b' << " " << 'g' << endl;
        return 0;
    }
    for(int i=3;i<=2e5;i++) {
        while(x%i==0) 
        {
            vs.push_back(i);
            x /= i;
        }
    }
    if(x%2==0) {
        vs.push_back(2);
        x/=2;
    }
    if(x!=1) {
        cout << -1 << endl;
        return 0;
    }
    int n = vs.size();
    vector<char> c;
    rep(i,n) c.push_back('b');
    vector<pair<int,int>> edge;
    for(int i=1;i<n;i++) edge.emplace_back(i-1,i);
    for(int i=0;i<n;i++) {
        rep(j,vs[i]) {
            c.push_back('g');
            edge.emplace_back(i,c.size());
            if(c.size()>2e5) {
                cout << -1 << endl;
                return 0;
            }
        }
    }
    cout << c.size() << endl;
    for(auto e : edge) {
        cout << e.first+1 << " " << e.second+1 << endl;
    }
    for(auto t : c) {
        cout << t << " ";
    }
    cout << endl;
    return 0;
}