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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int const N=1025;
int n,m,bst;
int a[N],b[N],sir[N];
int d[N][N];
int main()
{
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] = 1+ d[i-1][j-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])
sir[++bst]=a[i],--i,--j;
else if (d[i-1][j]<d[i][j-1])
--j;
else
--i;
fout<<bst<<'\n';
for(int i = bst; i; i--)
fout<<sir[i]<<' ';
return 0;
}