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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int a[1026],b[1026],c[1026][1026],memo[1026],k;
int main(){
int m,n;
in>>m>>n;
for(int i=1;i<=m;i++)in>>a[i];
for(int i=1;i<=n;i++)in>>b[i];
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;
k++;
memo[k]=a[i];
}
else c[i][j]=max(c[i-1][j],c[i][j-1]);
}
out<<c[m][n]<<'\n';
for(int i=1;i<=k;i++)out<<memo[i]<<' ';
}