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#include <iostream>
#include <fstream>
using namespace std;
int v[1025][1025],nr[1024],mr[1024];
int main()
{
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m;
f>>n>>m;
int i,j;
for(i=0;i<n;i++)f>>nr[n-i-1];
for(i=0;i<m;i++)f>>mr[m-i-1];
for(i=1;i<=n;i++)for(j=1;j<=m;j++)
{
if(nr[i-1]==mr[j-1])v[i][j]=1+v[i-1][j-1];
else v[i][j]=max(v[i-1][j],v[i][j-1]);
}
g<<v[n][m]<<'\n';
for(i=n,j=m;i!=0&&j!=0;)
{
if(nr[i-1]==mr[j-1])
{
g<<nr[i-1]<<' ';
i--;
j--;
}
else if(v[i-1][j]==v[i][j])i--;
else j--;
}
}