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#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin ("cmlsc.in");
ofstream fout ("cmlsc.out");
int a[1027][1027], n, m, vn[1027], vm[1027], sol[1027];
int main()
{
fin>>n>>m;
for(int i=1; i<=n; i++)
{
fin>>vn[i];
}
for(int j=1; j<=m; j++)
{
fin>>vm[j];
}
for(int i=1; i<=n; i++)
{
for(int j=1; j<=m; j++)
{
if(vn[i]==vm[j]){a[i][j]=a[i-1][j-1]+1;}
else
a[i][j]=max(a[i-1][j], a[i][j-1]);
}
}
fout<<a[n][m]<<"\n";
int l=a[n][m];
int i=n, j=m;
while(i>0 && j>0)
{
int x=a[i][j];
while(j>0 && a[i][j]==x)j--;
j++;
while(i>0 && a[i][j]==x)i--;
i++;
sol[l]=vn[i];
l--;
i--;
}
for(int i=1; i<=a[n][m]; i++)
{
fout<<sol[i]<<" ";
}
return 0;
}