Problem: Students went into a class to write a test and sat in some way. The teacher thought: "Probably they sat in this order to copy works of each other. I need to rearrange them in such a way that students that were neighbors are not neighbors in a new seating."

The class can be represented as a matrix with n rows and m columns with a student in each cell. Two students are neighbors if cells in which they sit have a common side.

Let's enumerate students from 1 to n·m in order of rows. So a student who initially sits in the cell in row i and column j has a number (i - 1)·m + j. You have to find a matrix with n rows and m columns in which all numbers from 1 to n·m appear exactly once and adjacent numbers in the original matrix are not adjacent in it, or determine that there is no such matrix.

Input

The only line contains two integers n and m (1 ≤ n, m ≤ 105; n·m ≤ 105) — the number of rows and the number of columns in the required matrix.

Output

If there is no such matrix, output "NO" (without quotes). 

Otherwise in the first line output "YES" (without quotes), and in the next n lines output m integers which form the required matrix.

Examples

Input

2 4


Output

YES
5 4 7 2 
3 6 1 8 


Input

2 1


Output

NO

Note

In the first test case the matrix initially looks like this:
    
    
      
    1 2 3 4  
    5 6 7 8  
    

It's easy to see that there are no two students that are adjacent in both matrices.

In the second test case there are only two possible seatings and in both of them students with numbers 1 and 2 are neighbors.

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
template <class t, class u>
void chmax(t& first, u second) {
  if (first < second) first = second;
}
template <class t, class u>
void chmin(t& first, u second) {
  if (second < first) first = second;
}
template <class t>
using vc = vector<t>;
template <class t>
using vvc = vc<vc<t>>;
using pi = pair<ll, ll>;
using vi = vc<ll>;
template <class t, class u>
ostream& operator<<(ostream& os, const pair<t, u>& p) {
  return os << "{" << p.first << "," << p.second << "}";
}
template <class t>
ostream& operator<<(ostream& os, const vc<t>& v) {
  os << "{";
  for (auto e : v) os << e << ",";
  return os << "}";
}
using uint = unsigned;
using ull = unsigned long long;
template <class t, size_t n>
ostream& operator<<(ostream& os, const array<t, n>& first) {
  return os << vc<t>(first.begin(), first.end());
}
template <ll i, class T>
void print_tuple(ostream&, const T&) {}
template <ll i, class T, class H, class... Args>
void print_tuple(ostream& os, const T& t) {
  if (i) os << ",";
  os << get<i>(t);
  print_tuple<i + 1, T, Args...>(os, t);
}
template <class... Args>
ostream& operator<<(ostream& os, const tuple<Args...>& t) {
  os << "{";
  print_tuple<0, tuple<Args...>, Args...>(os, t);
  return os << "}";
}
template <class t>
void print(t x, ll suc = 1) {
  cout << x;
  if (suc == 1) cout << "\n";
  if (suc == 2) cout << " ";
}
ll read() {
  ll i;
  cin >> i;
  return i;
}
vi readvi(ll n, ll off = 0) {
  vi v(n);
  for (ll i = ll(0); i < ll(n); i++) v[i] = read() + off;
  return v;
}
template <class T>
void print(const vector<T>& v, ll suc = 1) {
  for (ll i = ll(0); i < ll(v.size()); i++)
    print(v[i], i == ll(v.size()) - 1 ? suc : 2);
}
string readString() {
  string s;
  cin >> s;
  return s;
}
template <class T>
T sq(const T& t) {
  return t * t;
}
void yes(bool ex = true) {
  cout << "YES"
       << "\n";
  if (ex) exit(0);
}
void no(bool ex = true) {
  cout << "NO"
       << "\n";
  if (ex) exit(0);
}
void possible(bool ex = true) {
  cout << "POSSIBLE"
       << "\n";
  if (ex) exit(0);
}
void impossible(bool ex = true) {
  cout << "IMPOSSIBLE"
       << "\n";
  if (ex) exit(0);
}
constexpr ll ten(ll n) { return n == 0 ? 1 : ten(n - 1) * 10; }
const ll infLL = LLONG_MAX / 3;
const ll inf = infLL;
ll topbit(signed t) { return t == 0 ? -1 : 31 - __builtin_clz(t); }
ll topbit(ll t) { return t == 0 ? -1 : 63 - __builtin_clzll(t); }
ll botbit(signed first) { return first == 0 ? 32 : __builtin_ctz(first); }
ll botbit(ll first) { return first == 0 ? 64 : __builtin_ctzll(first); }
ll popcount(signed t) { return __builtin_popcount(t); }
ll popcount(ll t) { return __builtin_popcountll(t); }
bool ispow2(ll i) { return i && (i & -i) == i; }
ll mask(ll i) { return (ll(1) << i) - 1; }
bool inc(ll first, ll second, ll c) { return first <= second && second <= c; }
template <class t>
void mkuni(vc<t>& v) {
  sort(v.begin(), v.end());
  v.erase(unique(v.begin(), v.end()), v.end());
}
ll rand_int(ll l, ll r) {
  static mt19937_64 gen(chrono::steady_clock::now().time_since_epoch().count());
  return uniform_int_distribution<ll>(l, r)(gen);
}
template <class t>
void myshuffle(vc<t>& first) {
  for (ll i = ll(0); i < ll(ll(first.size())); i++)
    swap(first[i], first[rand_int(0, i)]);
}
template <class t>
ll lwb(const vc<t>& v, const t& first) {
  return lower_bound(v.begin(), v.end(), first) - v.begin();
}
signed main() {
  cin.tie(0);
  ios::sync_with_stdio(0);
  cout << fixed << setprecision(20);
  ll n, m;
  cin >> n >> m;
  vc<pi> z;
  for (ll i = ll(0); i < ll(n); i++)
    for (ll j = ll(0); j < ll(m - 1); j++) {
      z.emplace_back(i * m + j, i * m + j + 1);
    }
  for (ll i = ll(0); i < ll(n - 1); i++)
    for (ll j = ll(0); j < ll(m); j++) {
      z.emplace_back(i * m + j, (i + 1) * m + j);
    }
  bool f = n > m;
  if (f) swap(n, m);
  vvc<ll> ans(n, vi(m));
  if (m >= 4) {
    for (ll i = ll(0); i < ll(n); i++) {
      ll head = i * m;
      for (ll j = 1; j < m; j += 2) ans[i][j] = head++;
      for (ll j = 0; j < m; j += 2) ans[i][j] = head++;
      if (i % 2) {
        if (m % 2) {
          for (ll j = ll(0); j < ll(m); j++) {
            ans[i][j] = i * m + (m - 1 - (ans[i][j] - i * m));
          }
        }
        reverse(ans[i].begin(), ans[i].end());
      }
    }
  } else if (m == 3) {
    if (n == 3) {
      ans[0] = {6, 4, 2};
      ans[1] = {0, 8, 3};
      ans[2] = {5, 1, 7};
    } else {
      no();
    }
  } else if (m == 2) {
    no();
  } else {
    ans[0] = {0};
  }
  if (f) {
    vvc<ll> tmp(m, vi(n));
    for (ll i = ll(0); i < ll(n); i++)
      for (ll j = ll(0); j < ll(m); j++)
        tmp[j][i] = ans[i][j] % m * n + ans[i][j] / m;
    swap(n, m);
    ans = tmp;
  }
  ll pre = ll(z.size());
  for (ll i = ll(0); i < ll(n); i++)
    for (ll j = ll(0); j < ll(m - 1); j++) {
      z.push_back(minmax(ans[i][j], ans[i][j + 1]));
    }
  for (ll i = ll(0); i < ll(n - 1); i++)
    for (ll j = ll(0); j < ll(m); j++) {
      z.push_back(minmax(ans[i][j], ans[i + 1][j]));
    }
  mkuni(z);
  assert(ll(z.size()) == pre * 2);
  {
    vi p;
    for (ll i = ll(0); i < ll(n); i++)
      for (ll j = ll(0); j < ll(m); j++) p.push_back(ans[i][j]);
    mkuni(p);
    assert(ll(p.size()) == n * m);
  }
  yes(0);
  for (auto vs : ans) {
    for (auto& v : vs) v++;
    print(vs);
  }
}