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#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[2005],b[2005],c[2005][2005],n,m;
int main()
{
vector<int>G;
fin>>m>>n;
for(int i=1;i<=m;i++)fin>>a[i];
for(int j=1;j<=n;j++)fin>>b[j];
for(int i=0;i<=m;i++)c[i][0]=0;
for(int j=0;j<=n;j++)c[0][j]=0;
for(int i=1;i<=m;i++){
for(int j=1;j<=n;j++){
if(a[i]==b[j]){c[i][j]=c[i-1][j-1]+1;G.push_back(a[i]);}
else c[i][j]=max(c[i-1][j],c[j][i-1]);
}
}
fout<<c[m][n]<<'\n';
for(int i=0;i<G.size();i++)
fout<<G[i]<<' ';
}