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#include <stdio.h>
using namespace std;
int main()
{
freopen("cmlsc.in","r",stdin);
freopen("cmlsc.out","w",stdout);
short int maxx=0,k=0,j,n,m,i,v[1025],v2[1025],v3[1025];
bool ok;
v3[0]=0;
scanf("%hu%hu",&n,&m);
for(i=1; i<=n; i++)
scanf("%hu",&v[i]);
for(i=1; i<=m; i++)
scanf("%hu",&v2[i]);
for(i=1; i<=n; i++)
{
ok=false;
for(j=1; j<=m; j++)
{
if(v[i]==v2[j] && j>k)
{
v3[i]=v3[i-1]+1;
k=j;
j=m;
ok=true;
}
}
if(!ok)
v3[i]=v3[i-1];
}
for(i=1; i<=n; i++)
{
if(v3[i]>v3[i-1])
maxx++;
}
printf("%hu\n",maxx);
for(i=1; i<=n; i++)
{
if(v3[i]>v3[i-1])
printf("%hu ",v[i]);
}
return 0;
}