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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int a[1030],b[1030],dd[1030][1030],sub[1030];
int main(){
long long 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])
dd[i][j]=dd[i-1][j-1]+1;
else
dd[i][j]=max(dd[i-1][j],dd[i][j-1]);
}
}
out <<dd[m][n]<<"\n";
int ii=0;
for(int i=m,j=n;i>=1 and j>=1;){
if(a[i]==b[j])
sub[++ii]=a[i],j--,i--;
else if(dd[i-1][j]<dd[i][j-1])
j--;
else {
i--;
}
}
for(int i=ii;i>=1;i--){
out <<sub[i]<<" ";
}
return 0;
}