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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int ma[260][260],n,m,v[260],p=0;
int a[1025],b[1025];
int main()
{
int i,j;
in>>m>>n;
for(i=1;i<=m;i++)
in>>a[i];
for(i=1;i<=n;i++)
in>>b[i];
in.close();
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
if(a[i]!=b[j])
ma[i][j]=max(ma[i-1][j],ma[i][j-1]);
else if(a[i]==b[j])
ma[i][j]=ma[i-1][j-1]+1;
out<<ma[m][n]<<"\n";
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
if(ma[i][j]!=ma[i-1][j-1]&&p!=ma[i][j]){out<<a[i]<<" ";p=ma[i][j];}
out.close();
return 0;
}