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#include <vector>
#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
vector<int>v;
int a[1050],b[1050],n,m;
int t[1050][1050];
void citire()
{
fin>>n>>m;
for(int i=1;i<=n;i++)fin>>a[i];
for(int i=1;i<=m;i++)fin>>b[i];
}
void mat()
{
for(int i=1;i<=m;i++)
{
for(int j=1;j<=n;j++)
{
if(a[j]==b[i])
{
t[i][j]=t[i-1][j-1]+1;
//cout<<a[j]<<" ";
v.push_back(a[j]);
}
else
{
t[i][j]=max(t[i-1][j],t[i][j-1]);
}
}
}
}
int main()
{
citire();
mat();
fout<<t[m][n]<<'\n';
for(auto &i:v)
fout<<i<<" ";
return 0;
}