#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define REP(i, x, y) for (auto i = (x); i < (y); i++)
#define RREP(i, x, y) for (auto i = (y) - 1; (x) <= i; i--)
#define ALL(x) (x).begin(), (x).end()
#pragma GCC optimize("O3")
int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  ll X;
  cin >> X;
  if(X == 1){
    cout << "2\n1 2\nb g\n";
    return 0;
  }
  vector<int> m;
  REP(i, 2, 200000){
    while(X % i == 0){
      m.push_back(i);
      X /= i;
    }
  }
  if(X != 1){
    cout << -1 << "\n";
    return 0;
  }
  ll sum = 0;
  for(auto v: m){
    sum += v;
  }
  if(200000 < ssize(m) + sum){
    cout << -1 << "\n";
    return 0;
  }
  cout << ssize(m) + sum << "\n";
  REP(i, 1, ssize(m)){
    cout << i << " " << i+1 << "\n";
  }
  int idx = ssize(m) + 1;
  REP(i, 0, ssize(m)){
    REP(j, 0, m[i]){
      cout << i+1 << " " << idx << "\n";
      idx++;
    }
  }
  REP(i, 0, ssize(m)){
    cout << "b ";
  }
  REP(i, 0, sum){
    cout << "g ";
  }
  cout << "\n";
  return 0;
}
/*
  File : ~/yukicoder/midoriika_3rd/K.cpp
  Date : 2024/10/12
  Time : 16:02:23
*/