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#include <bits/stdc++.h>
using namespace std;
ifstream fin ("cmlsc.in");
ofstream fout ("cmlsc.out");
int m,n,i,j,k;
int a[1024],b[1024],sir[2048];
int main()
{
fin>>m>>n;
for (i=1; i<=m; i++)
fin>>a[i];
for (i=1; i<=n; i++)
fin>>b[i];
for (i=1; i<=m; i++)
{
for (j=1; j<=n; j++)
if (a[i]==b[j])
{
sir[++k]=a[i];
break;
}
}
fout<<k<<'\n';
for (i=1; i<=k; i++)
fout<<sir[i]<<' ';
return 0;
}