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#include <bits/stdc++.h>
using namespace std;
ifstream fin("date.in");
ofstream fout("date.out");
int n, m, a[1025], b[1025], mat[1025][1025], c, rez[1025], cnt;
int main(){
fin>>n;
for(int i=1;i<=n;i++){
fin>>a[i];
}
fin>>m;
for(int i=1;i<=m;i++){
fin>>b[i];
}
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
if(a[i]==b[j]){
mat[i][j] = mat[i-1][j-1] + 1;
}else{
mat[i][j]= max(mat[i-1][j], mat[i][j-1]);
}
}
}
fout<<mat[n][m]<<endl;
int i=n, j=m;
while(i && j){
if(a[i]==b[j]){
cnt++;
rez[cnt] = a[i];
i--;
j--;
}else if(mat[i-1][j]<mat[i][j-1]){
j--;
}else{
i--;
}
}
for(int i=cnt;i>=1;i--){
fout<<rez[i]<<" ";
}
return 0;
}