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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int m,n,c[1026][1026],a[1026],b[1026],s[1026],vf=0;
int main()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>a[i];
for(int i=1;i<=m;i++)
fin>>b[i];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
if(a[i]==b[j])
c[i][j]=1+c[i-1][j-1];
else
c[i][j]=max(c[i-1][j],c[i][j-1]);
}
for(int i=n,j=m;i&&j;)
{
if(a[i]==b[j])
{
s[++vf]=a[i];
i--;
j--;
}
else
if(c[i-1][j]>c[i][j-1])
i--;
else
j--;
}
fout<<vf<<endl;
for(int i=vf;i>=1;i--)
fout<<s[i]<<" ";
return 0;
}