#include <iostream>
#include <vector>
#include <map>
#include <cassert>

using namespace std;
using ll = long long;


int main(){
  const ll mx = 200'000;
  ll x;
  cin >> x;
  if (x == 1){
    cout << 2 << endl;
    cout << "1 2" << endl;
    cout << "b g" << endl;
    return 0;
  }
  map<ll, ll> cnt;
  for(ll i = 2; i <= mx; i++){
    if (i * i > x) break;
    while(x % i == 0){
      x /= i;
      cnt[i]++;
    }
  }
  if (x <= mx && x != 1) {
    cnt[x]++;
    x = 1;
  }
  if(x > 1) {
    cout << -1 << endl;
    return 0;
  }
  ll n = 0;
  ll b = 0;
  for(auto p: cnt){
    if (p.first == 2){
      n += p.second / 2 * 5;
      b += p.second / 2;
      n += p.second % 2 * 3;
      b += p.second % 2;
    }
    else{
      n += p.second * (p.first + 1);
      b += p.second;
    }
    if (n > mx){
      cout << -1 << endl;
      return 0;
    }
  }
  cout << n << endl;
  for (int i = 0; i < b - 1; i++){
    cout << i + 1 << " " << i + 2 << endl;
  }
  int g = 0;
  int useb = 0;
  for(auto p: cnt){
    if (p.first == 2){
      for (int i = 0; i < p.second / 2; i++){
        for (int j = 0; j < 4; j++){
          cout << useb + 1 << " " << b + g + 1 << endl;
          g++;
        }
        useb++;
      }
      for (int i = 0; i < p.second % 2; i++){
        for (int j = 0; j < 2; j++){
          cout << useb + 1 << " " << b + g + 1 << endl;
          g++;
        }
        useb++;
      }
    }
    else{
      for (int i = 0; i < p.second; i++){
        for (int j = 0; j < p.first; j++){
          cout << useb + 1 << " " << b + g + 1 << endl;
          g++;
        }
        useb++;
      }
    }
  }
  assert(b == useb);
  assert(b + g == n);
  for (int i = 0; i < b; i++){
    cout << "b ";
  }
  for(int i = 0; i < n - b; i++){
    if (i != n - b - 1) cout << "g ";
    else cout << "g" << endl;
  }
}