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#include <iostream>
#include <fstream>
using namespace std;
int main()
{
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int m,n,a[30],b[30],c[30],j,i;
f>>m>>n;
for(i=1;i<=m;i++)
f>>a[i];
for(j=1;j<=n;j++)
f>>b[i];
j=1;
for(i=1;i<=m;i++)
for(i=1;i<=n;i++)
if(a[i]==b[i])
{
c[j]=a[i];
j++;
}
g<<j<<endl;
for(i=1;i<=j;i++)
g<<c[j]<<" ";
f.close();
g.close();
}