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#include <fstream>
using namespace std;
ifstream cin("cmlsc.in");
ofstream cout("cmlsc.out");
int v[1026][1026],s1[1026], s2[1026];
void afisare(int i, int j)
{
if(i>=1 && j>=1)
{
if(s1[i]==s2[j])
{
afisare(i-1,j-1);
cout<<s1[i]<<" ";
}
else if(v[i-1][j]>v[i][j-1])
{
afisare(i-1,j);
}
else
{
afisare(i,j-1);
}
}
}
int main()
{
int n,m;
cin>>n>>m;
for(int i=1; i<=n; i++)
{
cin>>s1[i];
}
for(int j=1; j<=m ; j++)
{
cin>>s2[j];
}
for(int i=1; i<=n; i++)
{
for(int j=1; j<=m; j++)
{
if(s1[i]==s2[j])
{
v[i][j]=v[i-1][j-1]+1;
}
else
{
v[i][j]=max(v[i-1][j],v[j][i-1]);
}
}
}
cout<<v[n][m]<<'\n';
afisare(n,m);
return 0;
}