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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int d[1001], a[1001], b[1001], n, m, k;
int main()
{
f >> n >> m;
for(int i=1; i<=n; i++)
f >> a[i];
for(int i=1; i<=m; i++)
f >> b[i];
k=0;
for(int i=1; i<=n; i++)
for(int j=1; j<=m; j++)
if(a[i] == b[j])
{
d[++k] = a[i];
}
g << k << '\n';
for(int i=1; i<=k; i++)
g << d[i] << ' ';
return 0;
}