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#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,i,j,k;
int a[1025],b[1025],rez[1025],d[1025][1025];
int main()
{
f>>n>>m;
for(i=1;i<=n;i++)
f>>a[i];
for(i=1;i<=m;i++)
f>>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]);
}
i=n; j=m;
while(i>0 && j>0)
{
if(a[i]==b[j])
{
rez[++k]=a[i];
i--;j--;
}
else
if(d[i-1][j]>d[i][j-1])
i--;
else j--;
}
g<<k<<endl;
for(i=k;i>=1;i--)
g<<rez[i]<<" ";
return 0;
}