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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,a[1200],b[1200],d[1200][1200],sir[1200],k,i,j;
int main()
{
fin>>n>>m;
for(i=1;i<=n;i++)
{
fin>>a[i];
}
for(i=1;i<=m;i++)
{
fin>>b[i];
}
for(i=1;i<=n;i++)
{
for(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]);
}
}
}
i=n;
j=m;
while(i>0 && j>0)
{
if(d[i][j]==d[i-1][j])
{
i--;
}
else
{
if(d[i][j]==d[i][j-1])
{
j--;
}
else
{
k++;
sir[k]=a[i];
i--;
j--;
}
}
}
fout<<k<<"\n";
for(i=k;i>=1;i--)
{
fout<<sir[i]<<" ";
}
fin.close();
fout.close();
return 0;
}