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#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
short n,m,i,j,t[1025][1025],a[1025],b[1025],best,ans[1025],k;
int main()
{
f>>m>>n;
for(i=1;i<=m;i++)f>>a[i];
for(i=1;i<=n;i++)f>>b[i];
for(i=1;i<=m;i++)
{
for(j=1;j<=n;j++)
{
if(a[i]==b[j])t[i][j]=t[i-1][j-1]+1;
else
{
t[i][j]=max(t[i-1][j],t[i][j-1]);
}
best=max(best,t[i][j]);
}
}
g<<best<<'\n';
i=m;j=n;
while(i)
{
if(a[i]==b[j])ans[++k]=a[i],i--,j--;
else if(t[i][j-1]>t[i-1][j])j--;
else
i--;
}
for(i=k;i>=1;i--)g<<ans[i]<<" ";
return 0;
}