#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m, c = 1;
  scanf("%d %d", &n, &m);
  int a[n + 10][m + 10];
  for (int i = 1; i <= n; i++) {
    for (int j = 1; j <= m; j++) a[i][j] = c++;
  }
  if (n == 1) {
    if (m == 2 || m == 3) {
      puts("-1");
      return 0;
    }
    for (int i = 2; i <= m; i += 2) printf("%d ", i);
    for (int i = 1; i <= m; i += 2) printf("%d ", i);
    return 0;
  }
  if (m == 1) {
    if (n == 2 || n == 3) {
      puts("-1");
      return 0;
    }
    for (int i = 2; i <= n; i += 2) printf("%d\n", i);
    for (int i = 1; i <= n; i += 2) printf("%d\n", i);
    return 0;
  }
  if (n == 2 && m == 2) {
    puts("-1");
    return 0;
  }
  for (int j = 2; j <= m; j += 2) {
    for (int i = 1; i < n; i++) {
      swap(a[i][j], a[i + 1][j]);
    }
  }
  for (int i = 1; i <= n; i++) {
    for (int j = 1; j <= m; j++) {
      printf("%d ", a[i][j]);
    }
    puts("");
  }
  return 0;
}
