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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,a[1100],b[1100],v[1100][1100],i;
void citire()
{
f>>n>>m;
for(i=1;i<=n;i++) f>>a[i];
for(i=1;i<=m;i++) f>>b[i];
}
void dinamica()
{
int i,j;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(a[i]==b[j])
v[i][j]=v[i-1][j-1]+1;
else
v[i][j]=max(v[i-1][j],v[i][j-1]);
}
void afisare(int i,int j)
{
if(v[i][j])
if(a[i]==b[j])
afisare(i-1,j-1),g<<a[i]<<" ";
else
if(v[i][j]==v[i-1][j])
afisare(i-1,j);
else
afisare(i,j-1);
}
int main()
{
citire();
dinamica();
g<<v[n][m]<<endl;
afisare(n,m);
return 0;
}