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#include <fstream>
#include <climits>
using namespace std;
ifstream cin("cmlsc.in");
ofstream cout("cmlsc.out");
int n,m,a[1025],b[1025],d[1024][1024];
void f(int x,int y,int l)
{
if(l==0)
return;
if(a[x]==b[y])
{
f(x-1,y-1,l-1);
cout<<a[x]<<" ";
}
else
if(d[x-1][y]>d[x][y-1])
f(x-1,y,l);
else
f(x,y-1,l);
}
int main()
{
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])
d[i][j]=d[i-1][j-1]+1;
else
d[i][j]=max(d[i-1][j],d[i][j-1]);
}
cout<<d[n][m]<<'\n';
f(n,m,d[n][m]);
return 0;
}