#include <bits/stdc++.h>
using namespace std;
const long long N = 200;
long long A[N][N];
int32_t main() {
  long long n, m;
  cin >> n >> m;
  long long c1 = 1;
  if (n == 1 && m == 1) {
    cout << 1 << endl;
    return 0;
  }
  if (n < 3 && m < 3 || (n == 1 && m <= 3) || (m == 1 && n <= 3)) {
    cout << -1 << endl;
    return 0;
  }
  if (n == 2 && m == 3) {
    cout << "3 6 2" << endl << "5 1 4" << endl;
    return 0;
  }
  if (n == 1 && m == 4) {
    cout << "3 1 4 2" << endl;
    return 0;
  }
  if (m == 1 && n == 4) {
    cout << 3 << endl << 1 << endl << 4 << endl << 2 << endl;
    return 0;
  }
  for (long long i = 1; i <= n; i++) {
    for (long long j = 1; j <= m; j++) {
      if (i % 2 == j % 2) {
        A[i][j] = c1;
        c1++;
      }
    }
  }
  for (long long i = 1; i <= n; i++) {
    for (long long j = 1; j <= m; j++) {
      if (i % 2 != j % 2) {
        A[i][j] = c1;
        c1++;
      }
      cout << A[i][j] << ' ';
    }
    cout << endl;
  }
}
