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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,mat[1025][1025],a[1025],b[1025],rez[1025],k=0;
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<=m;i++)
for(int j=1;j<=n;j++)
{
if(a[j]==b[i])
{
mat[i][j]=mat[i-1][j-1]+1;
}
else mat[i][j]=max(mat[i-1][j],mat[i][j-1]);
}
fout<<mat[m][n]<<"\n";
int i=m;
int j=n;
while(i>0 && j>0)
{
if(mat[i-1][j-1]==mat[i][j]-1)
{
k++;
rez[k]=a[j];
i--;
j--;
}
else if(mat[i-1][j]>mat[i][j-1])
i--;
else
j--;
}
while(k>0)
{fout<<rez[k]<<" ";
k--;
}
return 0;
}