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#include <iostream>
#include <fstream>
using namespace std;
ifstream in ("cmlsc.in");
ofstream out ("cmlsc.out");
int main()
{
int m,n,a[1025]={},b[1025]={},i,j,c[257]={},gasit[1025]={},lmax=0;
in>>m>>n;
for(i=1;i<=m;i++)
in>>a[i];
for(j=1;j<=n;j++)
in>>b[j];
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
if(a[i]==b[j])c[a[i]]++;
for(i=1;i<m;i++)
{
if(c[a[i]]){
lmax=1;
gasit[lmax]=a[i];
for(j=i+1;j<=m;j++)
if(c[a[j]]){
lmax++;
gasit[lmax]=a[j];
}
}
}
cout<<lmax<<endl;
for(i=1;i<=lmax;i++)
{
cout<<gasit[i]<<' ';
}
return 0;
}