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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int i,j,n,m,a[20],b[20],c[20],x;
void citire()
{
fin>>n;
fin>>m;
for(i=1;i<=n;i++)
fin>>a[i];
for(j=1;j<=m;j++)
fin>>b[j];
fin.close();
}
void rezolvare()
{
x=0;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(a[i]==b[j])
{
x++;
c[x]=a[i];
}
}
void afisare()
{
fout<<x<<"\n";
for(i=1;i<=x;i++)
fout<<c[i];
fout.close();
}
int main()
{
citire();
rezolvare();
afisare();
return 0;
}