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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int a[1025],b[1025],n,m;
int rez[1025],lg[1025],nr;
void citire(){
in>>n>>m;
for(int i=1;i<=n;i++){
in>>a[i];
}
for(int i=1;i<=m;i++){
in>>b[i];
}
}
int maxim(int a, int b){
if(a>b)
return a;
else
return b;
}
void cmlsc(){
lg[0] = 0;
for(int i=1;i<=m;i++){
for(int j=1;j<=n;j++){
if(b[i] != a[j]){
lg[i]=maxim(lg[i-1],lg[i]);
}
else{
lg[i]=maxim(lg[i-1],lg[i])+1;
rez[++nr]=b[i];
}
}
}
out<<nr<<'\n';
for(int i=1;i<=nr;i++)
out<<rez[i]<<' ';
}
int main(){
citire();
cmlsc();
return 0;
}