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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int main()
{ int n,m,j,k=0,i,a[10],b[20];
f>>n>>m;
for(i=1;i<=n;i++)
f>>a[i];
for(i=1;i<=n;i++)
f>>b[i];
for(i=1;i<=n;i++)
for(j=1;j<n;j++)
if(a[i]==b[j])
{
k++;
}
g<<k<<endl;
for(i=1;i<=n;i++)
for(j=1;j<n;j++)
if(a[i]==b[j])
{
g<<a[i]<<" ";
}
return 0;
}