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#include <fstream>
#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int a[1025],b[1025],sol[1025],k,n,m;
int mat[1025][1025];
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];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{if(a[i]==b[j]) mat[i][j]=mat[i-1][j-1]+1;
else mat[i][j]=max(mat[i][j-1],mat[i-1][j]);
}
int i=n,j=m;
while(i && j)
{
if(a[i]==b[j]) sol[++k]=a[i],i--,j--;
else if(mat[i][j-1]>mat[i-1][j]) j--;
else i--;
}
g<<k<<"\n";
for(int i=k;i>=1;i--) g<<sol[i]<<" ";
return 0;
}