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#include<fstream>
#include<stack>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
const int NMAX=1035;
int mat[NMAX][NMAX],a[NMAX],b[NMAX],n,m;
stack<int>s;
int main()
{
fin>>n>>m;
for(int i=1;i<=n;++i)
fin>>a[i];
for(int i=1;i<=m;++i)
fin>>b[i];
for(int i=1;i<=n;++i)
for(int j=1;j<=m;++j)
if(a[i]==b[j])
mat[i][j]=1+mat[i-1][j-1];
else
mat[i][j]=max(mat[i-1][j],mat[i][j-1]);
fout<<mat[n][m]<<'\n';
int i=n,j=m;
while(i>=1)
if(a[i]==b[j])
{
s.push(a[i]);
--i;
--j;
}
else if(mat[i-1][j]<mat[i][j-1])
--j;
else
--i;
while(s.empty()==false)
{
fout<<s.top()<<' ';
s.pop();
}
}