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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,a[1025],b[1025];
int dp[1025][1025];
int sol[1025],lg;
void lcs()
{
//dinamica
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
if(a[i]==b[j]) dp[i][j]=dp[i-1][j-1]+1;
else dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
}
//sirul
for(int i=n,j=m;i;)
{
if(a[i]==b[j]) {sol[++lg]=a[i];i--;j--;}
else if(dp[i-1][j]<dp[i][j-1]) j--;
else i--;
}
}
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];
lcs();
fout<<dp[n][m]<<"\n";
for(int i=lg;i>0;i--) fout<<sol[i]<<" ";
}