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#include <bits/stdc++.h>
using namespace std;
ifstream fin ("cmlsc.in");
ofstream fout ("cmlsc.out");
int a[1030],b[1030];
bool x[1030][1030];
int v[1030];
int main()
{
int n,m;
fin>>n>>m;
for (int i=1;i<=n;i++) fin>>a[i];
for (int i=1;i<=m;i++) fin>>b[i];
int maxim=0;
for (int i=1;i<=n;i++) {
for (int j=1;j<=m;j++) {
if (a[i]==b[j]) {
bool ok=0;
for (int k=1;k<=i&&ok==0;k++) {
if (x[k][j]==1) ok=1;
}
if (ok==0) {
x[i][j]=1;
break;
}
}
}
}
for (int j=1;j<=m;j++) {
for (int i=1;i<=n;i++) {
if (x[i][j]==1) {
maxim++,v[maxim]=j;
break;
}
}
}
fout<<maxim<<"\n";
for (int i=1;i<=maxim;i++) fout<<b[v[i]]<<" ";
return 0;
}