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