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#include <iostream>
#include <fstream>
using namespace std;
ifstream f ("cmlsc.in");
ofstream g ("cmlsc.out");
int v[257], poz[257], a[1024], MAX;
int main()
{int n, m, i, x, ant;
f>>m>>n;
for (i=1; i<=m; i++)
{
f>>x;
v[x]=1;
poz[x]=i;
}
ant=n;
for (i=1; i<=n; i++){
f>>x;
if (v[x]==1 && poz[x]>=i) a[++MAX]=x;
}
g <<MAX<<"\n";
for (i=1; i<=MAX; i++)
g <<a[i]<<" ";
return 0;
}