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#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,nr,v[1050],w[1050],fin[1050],aux,d[1050][1050];
int main()
{
f>>n>>m;
for (int i=1; i<=n; ++i) f>>v[i];
for (int i=1; i<=m; ++i) f>>w[i];
for (int i=1; i<=n; ++i)
for (int j=1; j<=m; ++j)
if (v[i]==w[j]) d[i][j]=d[i-1][j-1]+1;
else d[i][j]=max(d[i][j-1],d[i-1][j]);
g<<d[n][m]<<'\n';
int i=n;
int j=m;
while (i!=0 && j!=0)
{
if (v[i]==w[j])
{
++aux;
fin[aux]=v[i];
--i;
--j;
}
else if (d[i-1][j]>d[i][j-1]) --i;
else --j;
}
for (int i=aux; i>=1; --i) g<<fin[i]<<' ';
g<<'\n';
f.close(); g.close();
return 0;
}