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#include <iostream>
#include <fstream>
#include <cstring>
#define LG 1026
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[LG],b[LG],n,m;
int c[LG][LG],v[LG],y=1;
int maxim(int a,int b){
if(a>b) return a; return b;
}
void dn(int n,int a[],int m,int b[]){
y=1;
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
if(a[i]==b[j]){
c[i][j]=c[i-1][j-1]+1;
v[y]=a[i]; y++;
}
else{
c[i][j]=maxim(c[i][j-1],c[i-1][j]);
}
}
}
fout<<c[n][m]<<'\n';
int i=n,j=m;
while (i>0 and j>0) {
while (c[i][j]==c[i-1][j]) i--;
while (c[i][j]==c[i][j-1]) j--;
v[c[i][j]] = a[i];
i--, j--;
}
for(int i=1;i<=c[n][m];i++) fout<<v[i]<<' ';
}
void solve(){
fin>>n>>m;
for(int i=1;i<=n;i++) fin>>a[i];
for(int i=1;i<=m;i++) fin>>b[i];
dn(n,a,m,b);
}
int main(){
solve();
return 0;
}