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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int v[1030],w[1030],a[1030][1030],n,m,i,j,sir[1032],nr;
int main()
{
f>>n>>m;
for(i=1;i<=n;i++)
f>>v[i];
for(i=1;i<=m;i++)
f>>w[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(v[i]==w[j])
a[i][j]=a[i-1][j-1]+1;
else
a[i][j]=max(a[i-1][j],a[i][j-1]);
for(i=n,j=m;j;)
if(v[i]==w[j])
{
sir[++nr]=v[i];
i--;j--;
}
else
if(a[i-1][j]>a[i][j-1])
i--;
else
j--;
g<<nr<<'\n';
for(i=nr;i;i--)
g<<sir[i]<<' ';
return 0;
}