#include <iostream>
#include <fstream>
using namespace std;

ifstream fin("interclasare.in");
ofstream fout("interclasare.out");

struct aaa{int val,l;};
aaa b[100001];

int i,j,n,a[100001],c[100001],m,x,k,q,l,maxi=-1;

int main()
{
    fin>>n;
    for(i=1; i<=n; i++)
        fin>>a[i];
    fin>>m;
    int j=1;
    for(i=1; i<=m; i++)
    {
        fin>>x;
        while(j<=n and a[j]<x) {k++;c[k]=a[j];j++;}
        k++;c[k]=x;
    }
    while(j<=n) {k++;c[k]=a[j];j++;}

    for(i=1; i<=k; i++)
    {
        q=i;maxi=0;

        for(j=i-1; j>=1; j--)
            if(c[i]>=b[j].val and b[j].l>=maxi)maxi=b[j].l;
        b[i].val=c[i];
        b[i].l=maxi+1;
        //fout<<c[i]<<" "<<b[q].val<<" "<<b[q].l<<" "<<q<<endl;
    }
    maxi=-1;
    for(i=1; i<=k; i++) if(maxi<b[i].l)maxi=b[i].l;
    fout<<maxi<<endl;
    for(i=1; i<=k; i++) fout<<c[i]<<" ";
    return 0;
}