#ifdef DEBUG_IS_VALID
#define DEB 1 
#define _LIBCPP_DEBUG 0
#else
#define DEB 0
#define NDEBUG
#endif

#include <bits/stdc++.h>
using namespace std;

#define ALL(g) (g).begin(),(g).end()
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define RREP(i, x, n) for(int i = x; i >= n; i--)
#define rrep(i, n) RREP(i,n,0)
#define pb push_back
#pragma GCC optimize ("-O3")

using namespace std;

#define DUMPOUT cout
#define dump(...) if(DEB) DUMPOUT<<"  "<<#__VA_ARGS__<<" :["<<__LINE__<<":"<<__FUNCTION__<<"]"<<endl<<"    "; if(DEB) dump_func(__VA_ARGS__)
template<typename T1,typename T2>ostream& operator << (ostream& os, pair<T1,T2> p){cout << "(" << p.first << ", " << p.second << ")"; return os;}
template<typename T>ostream& operator << (ostream& os, vector<T>& vec) { os << "{"; for (int i = 0; i<vec.size(); i++) os << vec[i] << (i + 1 == vec.size() ? "" : ", "); os << "}"; return os; }
template<typename T>ostream& operator << (ostream& os, set<T>& st){cout << "{"; for(auto itr = st.begin(); itr != st.end(); itr++) cout << *itr << (next(itr)!=st.end() ? ", " : ""); cout << "}"; return os;}
template<typename T1,typename T2>ostream& operator << (ostream& os, map<T1,T2> mp){cout << "{"; for(auto itr = mp.begin(); itr != mp.end(); itr++) cout << "(" << (itr->first) << ", " << (itr->second) << ")" << (next(itr)!=mp.end() ? "," : ""); cout << "}"; return os; }

void dump_func(){DUMPOUT << endl;}
template <class Head, class... Tail>void dump_func(Head&& head, Tail&&... tail){ DUMPOUT << head; if (sizeof...(Tail) == 0) { DUMPOUT << " "; } else { DUMPOUT << ", "; } dump_func(std::move(tail)...);}
template<class T> inline bool chmax(T& a,T const& b){if(a>=b) return false; a=b; return true;}
template<class T> inline bool chmin(T& a,T const& b){if(a<=b) return false; a=b; return true;}

using ll = long long;
using P = pair<int,int>;
using Pl = pair<ll,ll>;
using vi = vector<int>;
using vvi = vector<vi>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vp = vector<Pl>;
using vvp = vector<vp>;

const int INF = 1<<29;
const long long LINF=1LL<<59;


void solve(long long N, std::vector<long long> A){
  int m = 0;
  for(auto a:A) if(a<0) m++;
  vi idx(N); iota(ALL(idx),0);
  sort(ALL(idx),[&](int l,int r){return A[l]<A[r];});
  if(m==0){
    ll s = 0;
    rep(i,N) s+=A[i];
    s -= 2*A[idx[0]];
    cout << s << endl;
    s = A[idx[0]];
    rep(i,N-2){
      cout << s << " " << A[idx[i+1]] << endl;
      s -= A[idx[i+1]];
    }
    cout << A[idx[N-1]] << " " << s << endl;
  }else if(m!=N){
    ll s = 0;
    rep(i,N) s+=abs(A[i]);
    cout << s << endl;
    s = 0;
    rep(i,m-1){
      cout << A[idx[N-1]] << " " << A[idx[i]] << endl;
      A[idx[N-1]] -= A[idx[i]];
    }
    REP(i,m,N-1){
      cout << A[idx[m-1]] << " " << A[idx[i]] << endl;
      A[idx[m-1]] -= A[idx[i]];
    }
    cout << A[idx[N-1]] << " " << A[idx[m-1]] << endl;
  }else{
    ll s = 0;
    rep(i,N) s+=abs(A[i]);
    s += 2*A[idx[N-1]];
    cout << s << endl;
    rep(i,N-1){
      cout << A[idx[N-1]] << " " << A[idx[i]] << endl;
      A[idx[N-1]] -= A[idx[i]];
    }
  }
}

int main(){
  long long N;
  scanf("%lld",&N);
  std::vector<long long> A(N);
  for(int i = 0 ; i < N ; i++){
    scanf("%lld",&A[i]);
  }
  solve(N, std::move(A));
  return 0;
}


Measured memory_bytes: 3072