#include <stdio.h>   
long sir1[1025],sir2[1025],a[1025][1025],i,j,n,m,k,v[1025],l;           
int main()   
{   
    freopen("cmlsc.in","r",stdin);   
    freopen("cmlsc.out","w",stdout);   
    scanf("%ld %ld",&n,&m);   
       
    for(i=1;i<=n;i++)   
    scanf("%ld",&sir1[i]);   
       
    for(i=1;i<=m;i++)   
    scanf("%ld",&sir2[i]);   
  
    for(i=n;i>=1;i--)  
     for(j=m;j>=1;j--)   
    {   
     if(sir1[i]==sir2[j])
        a[i][j]=a[i+1][j+1]+1;
          else if(a[i][j+1]>a[i+1][j])a[i][j]=a[i][j+1];   
                 else a[i][j]=a[i+1][j];   
    }   
   
    for(i=1;i<=n;i++)  
    {  
    for(j=1;j<=m;j++)  
    printf("%ld",a[i][j]);  
    printf("\n");  
    }  
    i=1;j=1;k=0;
    for (i=1;i<=n;){
        if(sir1[i]==sir2[j])v[++k]=sir1[i],++i,++j;
        else if (a[i][j+1]<a[i+1][j])i++;
        else j++;
    }
    printf("%ld\n",k);
    for(i=1;i<=k;++i)
    printf("%ld ",v[i]);    
    printf("\n");
    return 0;     
}