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#include <fstream>
#include <algorithm>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int n,m;
short v1[1025],v2[1025];
short sol[1025],k;
short a[1025][1025];
void citire()
{
int i;
in>>m>>n;
for(i=1;i<=m;i++)
in>>v1[i];
for(i=1;i<=n;i++)
in>>v2[i];
}
void rezolvare ()
{
int i,j;
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
{
if(v1[i]==v2[j])
a[i][j]=a[i-1][j-1]+1;
else
a[i][j]=max(a[i][j-1],a[i-1][j]);
}
}
void afisare()
{
int i=m,j=n;
while(a[i][j])
{
if(v1[i]==v2[j])
sol[++k]=v1[i],i--,j--;
else if(a[i][j-1]>a[i-1][j])
j--;
else
i--;
}
reverse(sol+1,sol+k+1);
out<<a[m][n]<<'\n';
for(i=1;i<=k;i++)
out<<sol[i]<<' ';
}
int main()
{
citire();
rezolvare();
afisare();
return 0;
}