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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
#define MAX_N 1050
int a[MAX_N],b[MAX_N];
int n,m,l;
int lmax[MAX_N][MAX_N],comun[MAX_N];
int maxx=-1;
void rec()
{
for(int j=1;j<=m;j++)
{
for(int i=1;i<=n;i++)
{
if(a[i]==b[j])
{
lmax[i][j]=lmax[i-1][j-1]+1;
l++;
comun[l]=a[i];
}
else
lmax[i][j]=lmax[i-1][j-1];
lmax[i][j]=max(lmax[i][j],max(lmax[i-1][j],lmax[i][j-1]));
maxx=max(maxx,lmax[i][j]);
}
}
}
int main()
{
f>>n>>m;
for(int i=1;i<=n;i++)
f>>a[i];
for(int i=1;i<=m;i++)
f>>b[i];
rec();
g<<maxx<<"\n";
for(int i=1;i<=l;i++)
g<<comun[i]<<" ";
return 0;
}