typedef long long ll;
typedef long double ld;

#include <bits/stdc++.h>
using namespace std;
signed main() {
    ll x;
    std::cin >> x;
    ll sum = 0;
    if(x==1){
        std::cout << 2 << std::endl;
        std::cout << "1 2" << std::endl;
        std::cout << "b g" << std::endl;
        return 0;
    }
    
    multiset<ll> ms;
    for (ll i = 3; i <= 200000; i++) {
        while(x%i==0){
            ms.insert(i);
            x/=i;
            sum += i+1;
        }
    }
    while(x%2==0){
        ms.insert(2);
        x/=2;
        sum += 3;
    }
    if(sum<=200000){
        std::cout << sum << std::endl;
        for (int i = 0; i < ms.size()-1; i++) {
            std::cout << i+1<<" "<<i+2 << std::endl;
        }
        ll par = 1;
        ll index = ms.size()+1;
        for (auto e : ms) {
            for (int i = 0; i < e; i++) {
                std::cout << par<<" "<<index << std::endl;
                index++;
            }
            par++;
        }
        for (int i = 0; i < ms.size(); i++) {
            std::cout << "b ";
        }
        for (int i = 0; i < sum-ms.size(); i++) {
            std::cout << "g";
            if(i<sum-ms.size()-1){
                cout<<" ";
            }
        }
        std::cout << std::endl;
    }else{
        std::cout << -1 << std::endl;
    }
}