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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin ("cmlsc.in");
ofstream fout ("cmlsc.out");
int n, m;
int d[1005][1005], v[1005], w[1005];
void afis(int i, int j, int k){
if(k != 0){
if(v[i] == w[j]){
afis(i-1, j-1, k-1);
fout<<v[i]<<" ";
}else{
if(d[i-1][j] > d[i][j-1])
afis(i-1, j, k);
else afis(i, j-1, k);
}
}
}
int main (){
fin>>n>>m;
for(int i=1; i<=n; i++) fin>>v[i];
for(int i=1; i<=m; i++) fin>>w[i];
for(int i=1; i<=n; i++)
for(int j=1; j<=m; j++)
if(v[i] == w[j])
d[i][j]=d[i-1][j-1]+1;
else d[i][j]=max(d[i-1][j], d[i][j-1]);
fout<<d[n][m]<<"\n";
afis(n, m, d[n][m]);
return 0;
}