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#include <fstream>
using namespace std;
ifstream cin("cmlsc.in");
ofstream cout("cmlsc.out");
int a[1025],b[1025],dp[1025][1025],s[1025];
int main()
{
int i,j,n,m,nr;
cin>>n>>m;
for(i=1;i<=n;i++)
cin>>a[i];
for(i=1;i<=m;i++)
cin>>b[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(a[i]==b[j])
dp[i][j]=1+dp[i-1][j-1];
else
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
for(i=n,j=m;i>0;)
if(a[i]==b[j])
{
s[++nr]=a[i];
i--;
j--;
}
else if(dp[i-1][j]<dp[i][j-1])
j--;
else
i--;
cout<<nr<<endl;
for(i=nr;i>0;i--)
cout<<s[i]<<" ";
return 0;
}