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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int xx,y,max1,i,j,ok,x[5],n,m,a[1025],b[1025],k,v[1025];
int main()
{
f>>n>>m;
for(i=1;i<=n;i++)f>>a[i];
for(i=1;i<=m;i++)f>>b[i];
for(i=1;i<=n;i++)
{ok=0;
for(j=1;j<=m&&!ok;j++)
if(a[i]==b[j])
{
ok=1;
k++;
v[k]=a[i];
}
}
g<<k<<'\n';
for(i=1;i<=k;i++)
g<<v[i]<<" ";
return 0;
}