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#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
#include <string>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[1025],b[1025],c[1025][1025],n,m,r[1025],ct;
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;}
else c[i][j]=max(c[i-1][j],c[j][i-1]);
}
}
fout<<c[m][n]<<'\n';
int i=m,j=n;
while(i>=1&&j>=1)
{if(a[i]==b[j]){ct++;r[ct]=a[i];i--;j--;}
else if(c[i][j-1]>c[i-1][j])j--;
else i--;
}
for(int i=ct;i>=1;i--)
fout<<r[i]<<' ';
}