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

using int32 = int_fast32_t;
using int64 = int_fast64_t;

const int32 INF = 1e9;
const int32 MOD = 1e9+7;
const int64 LLINF = 1e18;

#define YES(n) cout << ((n) ? "YES\n" : "NO\n"  )
#define Yes(n) cout << ((n) ? "Yes\n" : "No\n"  )
#define POSSIBLE cout << ((n) ? "POSSIBLE\n" : "IMPOSSIBLE\n"  )
#define ANS(n) cout << (n) << "\n"
#define REP(i,n) for(int64 i=0;i<(n);++i)
#define FOR(i,a,b) for(int64 i=(a);i<(b);i++)
#define FORR(i,a,b) for(int64 i=(a);i>=(b);i--)
#define ALL(obj) (obj).begin(),(obj).end()
#define pii pair<int32,int32>
#define pll pair<int64,int64>
#define pb(a) push_back(a)

int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  int32 n;
  cin >> n;
  vector<int64> a(n);
  REP(i,n)cin >> a[i];
  int64 s = 0;
  REP(i,n)s ^= a[i];
  REP(i,n)a[i] &= ~s;
  // REP(i,n){
  //   cout << bitset<60>(a[i]) << endl;
  // }
  int32 r = 0;
  FORR(d,61,0){
    int32 i;
    for(i = r; i < n; ++i){
      if((a[i]>>d)&1){
        swap(a[r],a[i]);
        break;
      }
    }
    if(i == n)continue;
    REP(j,n){
      if(j == r)continue;
      if((a[j]>>d)&1)a[j] ^= a[r];
    }
    r++;
  }
  // REP(i,n){
  //   cout << bitset<60>(a[i]) << endl;
  // }
  int64 ad = 0;
  REP(i,n)ad ^= a[i];
  ANS(s + (ad << 1));
  return 0;
}
#include <bits/stdc++.h>
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define rep(i,n) for (int i=0;i<(int)(n);i++)
#define codefor int test;scanf("%d",&test);while(test--)
#define INT(...) int __VA_ARGS__;in(__VA_ARGS__)
#define LL(...) ll __VA_ARGS__;in(__VA_ARGS__)
#define yn(ans) if(ans)printf("Yes\n");else printf("No\n")
#define YN(ans) if(ans)printf("YES\n");else printf("NO\n")
#define vector1d(type,name,...) vector<type>name(__VA_ARGS__)
#define vector2d(type,name,h,...) vector<vector<type>>name(h,vector<type>(__VA_ARGS__))
#define umap unordered_map
#define uset unordered_set
using namespace std;
using ll = long long;
const int MOD=1000000007;
//入力系
void scan(int& a){scanf("%d",&a);}
void scan(long long& a){scanf("%lld",&a);}
template<class T> void scan(T& a){cin>>a;}
template<class T> void scan(vector<T>& vec){for(auto&& it:vec)scan(it);}
void in(){}
template <class Head, class... Tail> void in(Head& head, Tail&... tail){scan(head);in(tail...);}
//出力系
void print(const int& a){printf("%d",a);}
void print(const long long& a){printf("%lld",a);}
void print(const double& a){printf("%.15lf",a);}
template<class T> void print(const T& a){cout<<a;}
template<class T> void print(const vector<T>& vec){if(vec.empty())return;print(vec[0]);for(auto it=vec.begin();++it!= vec.end();){putchar(' ');print(*it);}}
void out(){putchar('\n');}
template<class T> void out(const T& t){print(t);putchar('\n');}
template <class Head, class... Tail> void out(const Head& head,const Tail&... tail){print(head);putchar(' ');out(tail...);}
//デバッグ系
template<class T> void dprint(const T& a){cerr<<a;}
template<class T> void dprint(const vector<T>& vec){if(vec.empty())return;cerr<<vec[0];for(auto it=vec.begin();++it!= vec.end();){cerr<<" "<<*it;}}
void debug(){cerr<<endl;}
template<class T> void debug(const T& t){dprint(t);cerr<<endl;}
template <class Head, class... Tail> void debug(const Head& head, const Tail&... tail){dprint(head);cerr<<" ";debug(tail...);}
ll intpow(ll a, ll b){ ll ans = 1; while(b){ if(b & 1) ans *= a; a *= a; b /= 2; } return ans; }
ll modpow(ll a, ll b, ll p){ ll ans = 1; while(b){ if(b & 1) (ans *= a) %= p; (a *= a) %= p; b /= 2; } return ans; }
ll updivide(ll a,ll b){if(a%b==0) return a/b;else return (a/b)+1;}

int main(){
    INT(h,w);
    vector2d(int,table,h,w);
    vector<tuple<int,int,int,int>> ope;
    in(table);
    rep(y,h){
        rep(x,w){
            table[y][x]%=2;
            if(y<h-1&&table[y][x]==1){
                table[y+1][x]++;
                ope.push_back(make_tuple(y+1,x+1,y+2,x+1));
            }
            if(y==h-1&&x+1<w&&table[y][x]==1){
                table[y][x+1]++;
                ope.push_back(make_tuple(y+1,x+1,y+1,x+2));
            }
        }
    }
    out(ope.size());
    rep(i,ope.size())out(get<0>(ope[i]),get<1>(ope[i]),get<2>(ope[i]),get<3>(ope[i]));
}
