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#include <fstream>
using namespace std;
ifstream f ("cmlsc.in");
ofstream g ("cmlsc.out");
long i, j, n, m, a[1024]={0}, b[1024]={0}, s[1024]={0}, d[1024][1024]={0}, k;
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)
{
if (a[i]==b[j])
{
k++;
s[k]=a[i];
i--;
j--;
}
else
{
if (d[i-1][j]<d[i][j-1])
{
j--;
}
else
{
i--;
}
}
}
g<<k<<'\n';
for (i=k; i>0; i--)
{
g<<s[i]<<' ';
}
}