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#include <fstream>
using namespace std;
ifstream cin ("cmlsc.in");
ofstream cout ("cmlsc.out");
int MAX=1025*1025;
int a[1025];
int b[1025];
int v[MAX][MAX];
int s[MAX];
int cnt;
int main()
{
int n,m;
cin>>n>>m;
for(int i=1;i<=n;i++)
cin>>a[i];
for(int i=1;i<=m;i++)
cin>>b[i];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
if(a[i]==b[j])
v[i][j]=1+v[i-1][j-1];
else
v[i][j]=max(v[i-1][j], v[i][j-1]);
}
cout<<v[n][m]<<'\n';
int i=n;
int j=m;
while(i!=0 || j!=0)
{
if(a[i]==b[j])
{
s[++cnt]=a[i];
i--;
j--;
}
else if(v[i-1][j]<v[i][j-1])
j--;
else i--;
}
for(int ii=cnt;ii>=1;ii--)
cout<<s[ii]<<' ';
return 0;
}