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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int a[1025],b[1025],sol1[1025],fra[257],frb[257],n,m,ma,soll[1025],c[1025],sol[1025];
int main()
{
int i,j;
f>>n>>m;
for (i=1;i<=n;i++)
{
f>>a[i];
}
for (i=1;i<=m;i++)
{
f>>b[i];
c[i]=b[i];
frb[b[i]]++;
}
for (i=1;i<=n;i++)
{
if (frb[a[i]]!=0)
{
ma=0;
for (j=1;j<=m;j++)
{
if (b[j]==a[i]) {soll[j]=ma+1;sol1[i]=ma+1;}
ma=max(ma,sol[j]);
}
for (j=1;j<=m;j++)
{
if (sol[j]<soll[j]) sol[j]=soll[j];
}
}
}
ma=0;
for (i=1;i<=n;i++)
{
ma=max(ma,sol1[i]);
}
// cout<<frb[1];
g<<ma<<"\n";
int t=0;
for (i=1;i<=n;i++)
{
if (sol1[i]==t+1) {t++;g<<a[i]<<" ";}
}
return 0;
}