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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int a[1025][1025],sol[1025];
int main()
{
int n,m,nr=0,v[1025],u[1025];
f>>n>>m;
for(int i=1;i<=n;++i)
f>>v[i];
for(int j=1;j<=m;++j)
f>>u[j];
for(int i=1;i<=n;++i)
for(int j=1;j<=m;++j)
if(v[i]==u[j])
{
sol[++nr]=v[i];
a[i][j]=a[i-1][j-1]+1;
}
else a[i][j]=max(a[i-1][j],a[i][j-1]);
g<<a[n][m]<<endl;
for(int i=1;i<=a[n][m];++i)
g<<sol[i]<<' ';
return 0;
}