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