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#include <iostream>
#include <fstream>
#define maxim(a,b) ((a>b)?a:b)
using namespace std;
fstream f;
int x[2000],y[2000], t[2000][2000],sol[2000];
int i,j,n,m;
main()
{
f.open("cmlsc.in",ios::in);
f>>n>>m;
for (i=1;i<=n;i++)
f>>x[i];
for (i=1;i<=m;i++)
f>>y[i];
for (i=1;i<=n;i++)
for (j=1;j<=m;j++)
{
if (x[i]==y[j]) t[i][j]=t[i-1][j-1]+1;
if (x[i]!=y[j])
t[i][j]=maxim(t[i-1][j],t[i][j-1]);
}
int k=0;
for (i=n,j=m;i;)
{
if (x[i]==y[j])
{sol[k]=x[i];
i--;
j--;
k++;}
else if (t[i][j-1]<t[i-1][j])
i--;
else j--;
}
k=t[n][m];
for (i=0;i<k/2;i++)
{
int aux;
aux=sol[i];
sol[i]=sol[k-i-1];
sol[k-i-1]=aux;
}
f.close();
f.open("cmlsc.out",ios::out);
f<<k<<endl;
for (i=0;i<k;i++)
f<<sol[i]<<" ";
}