#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define ALL(v) v.begin(),v.end()
typedef long long ll;

#include <bits/stdc++.h>
using namespace std;
template <class T> using V=vector<T>;
template <class T> using VV=V<V<T>>;

int main(){
  ios::sync_with_stdio(false);
  std::cin.tie(nullptr);

  ll x;
  cin>>x;
  
  if(x==1){
    cout<<2<<endl;
    cout<<1<<" "<<2<<endl;
    cout<<"b g"<<endl;
    return 0;
  }
  
  V<ll> A;
  V<ll> isprime(200200,1);
  isprime[0]=0,isprime[1]=0;
  for(int i=2;i<200200;i++){
    if(isprime[i]==0) continue;
    for(int j=2*i;j<200200;j+=i) isprime[j]=0;
    while(x%i==0){
      A.push_back(i);
      x/=i;
    }
  }
  if(x>1){
    cout<<-1<<endl;
    return 0;
  }
  int a=A.size();
  ll sum=a;
  rep(i,a) sum+=A[i];
  
  if(sum>200000){
    cout<<-1<<endl;
    return 0;
  }
  
  vector<int> U,V;
  int now=a;
  rep(i,a){
    rep(j,A[i]){
      now++;
      U.push_back(i+1),V.push_back(now);
    }
  }
  for(int i=0;i<a-1;i++) U.push_back(i+1),V.push_back(i+2);
  
  int u=U.size();
  if(u>200000){
    cout<<-1<<endl;
    return 0;
  }
  
  cout<<u<<'\n';
  rep(i,u) cout<<U[i]<<" "<<V[i]<<'\n';
  
  vector<char> C(now);
  rep(i,a) C[i]='b';
  for(int i=a;i<now;i++) C[i]='g';
  rep(i,now){
    if(i) cout<<" ";
    cout<<C[i];
  }
  cout<<'\n';

  return 0;
}