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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int c[1030][1030];
int main()
{
int n,m,a[1030],b[1030],d[1030];
fin>>n>>m;
for(int i=1; i<=n; i++)
fin>>a[i];
for(int j=1; j<=m; j++)
fin>>b[j];
for(int i=1; i<=n; i++)
for(int j=1; j<=m; j++)
{
if(a[i]==b[j])
c[i][j]=max(c[i-1][j],c[i][j-1])+1;
else
{
c[i][j]=max(c[i-1][j],c[i][j-1]);
}
}
int k=0;
int i=n;
int j=m;
while(c[i][j])
{
if(a[i]==b[j])
{
d[k]=a[i];
i--;
j--;
k++;
}
if(c[i-1][j]>c[i][j-1])
i--;
else
j--;
}
fout>>c[n][m]<<'\n';
for(int p=k-1; p>=0; p--)
fout<<d[p]<<" ";
return 0;
}