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#include <iostream>
#include <fstream>
#include <algorithm>
#include <cstdio>
#include <string>
#include <string.h>
#include <vector>
#include <queue>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int n,m,a[1026][1026];
vector<int>v,w;
void citire()
{
in>>n>>m;
v=vector<int>(n+1);
for(int i=1;i<=n;i++)
{
int x;
in>>x;
v[i]=x;
}
w=vector<int>(m+1);
for(int i=1;i<=m;i++)
{
int x;
in>>x;
w[i]=x;
}
}
void rezolva()
{
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
if(v[i]==w[j]) a[i][j]=a[i-1][j-1]+1;
else a[i][j]=max(a[i-1][j],a[i][j-1]);
}
}
}
void afisare()
{
vector<int> sir;
int i=n,j=m;
while(i and j)
{
if(v[i]==w[j])
{
sir.push_back(v[i]);
i--;
j--;
}
else if(a[i-1][j]<a[i][j-1]) j--;
else i--;
}
out<<sir.size()<<'\n';
for(int i=sir.size()-1;i>=0;i--)
out<<sir[i]<<" ";
}
int main()
{
citire();
rezolva();
afisare();
return 0;
}