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#include <iostream>
#include <fstream>
using namespace std;
int n,m,i,v[100000],x,nr=0,a[100000];
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int main()
{
in>>n>>m;
for(i=1;i<=257;i++)
v[i]=0;
for(i=1;i<=n;i++)
{
in>>x;
v[x]++;
}
for(i=1;i<=m;i++)
{
in>>x;
if(v[x]!=0)
{
nr++;
v[x]--;
a[nr]=x;
}
}
out<<nr<<endl;
for(i=1;i<=nr;i++)
out<<a[i]<<" ";
}