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#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;
vector <int>s;
int n,m,a[1025],b[1025],l[1025][1025],i,j;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int main()
{
f>>n>>m;
for(i=1;i<=n;i++)
f>>a[i];
for(j=1;j<=m;j++)
f>>b[j];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
if(a[i]==b[j])
l[i][j]=1+l[i-1][j-1];
else
l[i][j]=max(l[i-1][j],l[i][j-1]);
}
g<<l[n][m]<<'\n';
for(i=n,j=m;l[i][j];)
{
if(a[i]==b[j])
{
s.push_back(a[i]);
i--;
j--;
}
else
if(l[i][j]==l[i-1][j])
i--;
else
j--;
}
for(;s.size();s.pop_back())
g<<s.back()<<' ';
return 0;
}