#include <bits/stdc++.h>
int fx[] = {-1, 0, +1, 0}, fy[] = {0, +1, 0, -1},
    ex[] = {-1, -1, 0, +1, +1, +1, 0, -1},
    ey[] = {0, +1, +1, +1, 0, -1, -1, -1};
using namespace std;
int n, m;
int a[200][200];
int main() {
  scanf("%d%d", &n, &m);
  int cur = 1;
  for (int i = 0; i < n; i++)
    for (int j = 0; j < m; j++)
      if ((i + j) & 1) a[i][j] = cur++;
  for (int i = 0; i < n; i++)
    for (int j = 0; j < m; j++)
      if (!((i + j) & 1)) a[i][j] = cur++;
  for (int i = 0; i < n; i++)
    for (int j = 0; j < m; j++)
      if ((i + 1 < n && abs(a[i + 1][j] - a[i][j]) == 1) ||
          (j + 1 < m && abs(a[i][j + 1] - a[i][j]) == 1)) {
        puts("-1");
        return 0;
      }
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) printf("%d ", a[i][j]);
    printf("\n");
  }
  return 0;
}
