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#include <iostream>
#include <fstream>
#include <algorithm>
#include <cstring>
#include <vector>
#include <bitset>
#include <cmath>
#define x first
#define y second
#define Nmax 1024
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int a[Nmax], b[Nmax], d[Nmax][Nmax], sol[Nmax], best, N, M;
int main()
{
f>>N>>M;
for (int i=1; i<=N; ++i) f>>a[i];
for (int j=1; j<=M; ++j) f>>b[j];
for (int i=1; i<=N; ++i)
for (int j=1; j<=M; ++j)
if (a[i]==b[j]) d[i][j]=d[i-1][j-1]+1;
else d[i][j]=max(d[i-1][j], d[i][j-1]);
for (int i=N, j=M; i;)
if (a[i]==b[j]) sol[++best]=a[i], --i, --j;
else if (d[i-1][j]<d[i][j-1]) --j;
else --i;
g<<best<<'\n';
for (int i=best; i>0; --i)
g<<sol[i]<<' '; g<<'\n';
return 0;
}