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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
int s[1030][1030];
int main()
{
ifstream fin("cmlsc.in");
ofstream fout ("cmlsc.out");
int n, m,a[1030],b[1030],i,j;
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])
s[i][j]=s[i-1][j-1]+1;
else
s[i][j]=max(s[i-1][j],s[i][j-1]);
fout<<s[n][m]<<"\n";
i=n;
j=m;
int v[1030],k=0;
while(i!=0&&j!=0)
{
if(a[i]!=b[j])
{if(s[i-1][j]<s[i][j-1])
j--;
else
i--;}
else
{
v[++k]=a[i];
i--;
j--;
}
}
for(i=k;i>0;i--)
fout<<v[i]<<" ";
return 0;
}