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#include <iostream>
#include <fstream>
using namespace std;
int A[1030], B[1030], D[1030][1030], n, m, k, sol[1030];
int main()
{
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
fin>>n>>m;
for(int i=1;i<=n;i++)
{
fin>>A[i];
}
for(int j=1;j<=m;j++)
{
fin>>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;i>=1;i--)
{
for(int j=m;j>=1;j--)
{
if(A[i] == B[j])
{
sol[++k] = A[i];
}
else if (D[i][j-1] < D[i-1][j])
i--;
else
j--;
}
}
fout<<k<<'\n';
for(int i=k;i>=1;i--)
fout<<sol[i]<<' ';
}