#include <cstdio>
#include <vector>
using namespace std;

int main()
{
	freopen ("cmlsc.in", "r", stdin);
	freopen ("cmlsc.out", "w", stdout);
	
	int m,n,anz=0,max=0;
	vector <int> rezultate (1);
	scanf ("%d %d", &m,&n);
	int ab[m+1][n+1];
	for (int i=1;i<=m;i++)
		scanf ("%d", &ab[i][0]);
	for (int i=1;i<=n;i++)
		scanf ("%d", &ab[0][i]);
	
	for (int i=1;i<=m;i++)
		for (int j=1;j<=n;j++)
			ab[i][j]=0;
		
	for (int i=1;i<=m;i++)
		for (int j=1;j<=n;j++)
			if (ab[i][0]==ab[0][j])
			{
				if (i!=1 && j!=1)
					ab[i][j]=ab[i-1][j-1]+1;
				else
					ab[i][j]=1;
				if (ab[i][j]>anz)
					anz=ab[i][j];
			}
	for (int i=1;i<=m;i++)
		for (int j=1;j<=n;j++)
			if (ab[i][j]==anz)
			{
				max++;
				for (int t=anz-1;t>=0;t--)
					rezultate.push_back (ab[i-t][0]);
			}
	
	
	for (int i=0;i<=m;i++)
	{
		for (int j=0;j<=n;j++)
			printf ("%d ", ab[i][j]);
		printf ("\n");
	}
	
	printf ("%d \n", max);
	for (unsigned int i=1;i<rezultate.size();i++)
		printf ("%d ", rezultate[i]);
}