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