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#include <bits/stdc++.h>
using namespace std;
int main()
{
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int la, lb, a[1024], b[1024], sub[1024], lsub=0;
in>>la>>lb;
for(int i=0; i<la; i++)
in>>a[i];
for(int i=0; i<lb; i++)
in>>b[i];
for(int i=0; i<la; i++)
for(int j=0; j<lb; j++)
if(a[i]==b[j])
sub[lsub++]=a[i];
out<<lsub<<'\n';
for(int i=0; i<lsub; i++)
out<<sub[i]<<' ';
in.close();
out.close();
return 0;
}