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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[1025],fr[257],v[1025],lg[1025];
int main()
{
int n,m,i,x,k=0,j,maxx=0,maxim;
fin>>n>>m;
for(i=1;i<=n;i++)
fin>>a[i];
for(i=1;i<=m;i++)
{
fin>>x;
fr[x]=i;
}
for(i=1;i<=n;i++)
{
maxim=0;
for(j=1;j<i;j++)
if(fr[a[i]]>fr[a[j]] && lg[j]>maxim)
{
maxim=lg[j];
}
if(fr[a[i]]!=0)
lg[i]=maxim+1;
if(lg[i]>maxx)
maxx=lg[i];
}
fout<<maxx<<'\n';
for(i=n;i>=1;i--)
{
if(lg[i]==maxx && maxx!=0)
{
v[++k]=a[i];
maxx--;
}
}
for(i=k;i>=1;i--)
fout<<v[i]<<" ";
return 0;
}