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#include<iostream>
#include<fstream>
using namespace std;
int main()
{
int i,j,M,N,a[257],b[257],k=0,v[257];
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
fin>>M>>N;
for(i=1;i<=M+N;i++)
{
if(i<=M)
{
fin>>j;
a[i]=j;
}
else
{
fin>>j;
k++;
b[k]=j;
}
}
k=0;
for(i=1;i<=M;i++)
{
for(j=1;j<=N;j++)
{
if(a[i]==b[j])
{
k++;
v[k]=a[i];
}
}
}
fout<<k<<"\n";
for(i=1;i<=k;i++)
{
fout<<v[i]<<" ";
}
fin.close();
fout.close();
return 0;
}