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#include <fstream>
#include <stack>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,i,j,a[1025],b[1025],d[1025][1025];
stack <int> s;
int main()
{
fin>>n>>m;
for(i=1;i<=n;i++)
fin>>a[i];
for(i=1;i<=m;i++)
fin>>b[i];
for(i=1;i<=n;i++)
for(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]);
}
fout<<d[n][m]<<'\n';
for(i=n,j=m;i;)
{
if(a[i]==b[j]){s.push(a[i]);i--;j--;}
else if(d[i-1][j]<d[i][j-1])
j--;
else i--;
}
while(!s.empty())
{
fout<<s.top()<<" ";
s.pop();
}
return 0;
}