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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
int n,m,a[10001],b[10001],c[10001][10001],i,j,k,d[10001];
void cauta(int i,int j,int k)
{
if(k>0){
while(c[i-1][j]==k)i--;
while(c[i][j-1]==k)j--;
d[k]=a[i];
k--;
cauta(i-1,j-1,k);
}
}
int main()
{
ifstream fin("date.in");
ofstream fout("date.out");
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])c[i][j]=c[i-1][j-1]+1;
else c[i][j]=max(c[i][j-1],c[i-1][j]);
/*for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)cout<<c[i][j]<<" ";
cout<<endl;
}*/
fout<<c[n][m]<<endl;
cauta(n,m,c[n][m]);
for(i=1;i<=c[n][m];i++)fout<<d[i]<<" ";
fin.close();
fout.close();
return 0;
}