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#include <iostream>
#include <fstream>
using namespace std;
int a,b,v[1026],s[1026],i,j,k,mx,sc[1026];
int main()
{
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
in>>a>>b;
for(i=1;i<=a;i++)
{
in>>v[i];
}
for(i=1;i<=b;i++)
{
in>>s[i];
}
for(i=1;i<=a;i++)
{
for(j=1;j<=b;j++)
{
if(v[i]==s[j])
{
mx++;
sc[mx]=s[j];
for(k=1;k<j;k++)
{
s[k]=0;
}
}
}
}
out<<mx<<"\n";
for(i=1;i<=mx;i++)
{
out<<sc[i]<<" ";
}
return 0;
}