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#include <cstdio>
#include <algorithm>
using namespace std;
int d[1030][1030],v1[1030],v2[1030],sol[1030];
int main()
{
freopen("cmlsc.in", "r", stdin);
freopen("cmlsc.out", "w", stdout);
int n,m,nr=0;
scanf("%d%d",&n,&m);
for(int i=1;i<=n;i++) scanf("%d",&v1[i]);
for(int i=1;i<=m;i++) scanf("%d",&v2[i]);
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
d[i][j]=max(d[i-1][j],max(d[i][j-1],d[i-1][j-1]+(v1[i]==v2[j])));
for(int i=n,j=m;i && j;)
if(d[i][j]==d[i-1][j]) i--;
else if(d[i][j]==d[i][j-1]) j--;
else {sol[++nr]=v1[i];i--;j--;}
printf("%d\n",nr);
for(int i=nr;i;i--) printf("%d ",sol[i]);
return 0;
}