#include<bits/stdc++.h>

 using namespace std;

 typedef long long ll;

 typedef unsigned int uint;

 typedef unsigned long long ull;

 typedef long double ld;

 typedef pair<int,int> PII;

 typedef pair<ll,ll> Pll;

 typedef vector<int> VI;

 typedef vector<PII> VII;

 typedef pair<ll,ll>P;

 #define N  510

 #define M  1000000

 #define INF 1e9

 #define fi first

 #define se second

 #define MP make_pair

 #define pb push_back

 #define pi acos(-1)

 #define mem(a,b) memset(a,b,sizeof(a))

 #define rep(i,a,b) for(int i=(int)a;i<=(int)b;i++)

 #define per(i,a,b) for(int i=(int)a;i>=(int)b;i--)

 #define lowbit(x) x&(-x)

 #define Rand (rand()*(1<<16)+rand())

 #define id(x) ((x)<=B?(x):m-n/(x)+1)

 #define ls p<<1

 #define rs p<<1|1

 #define fors(i) for(auto i:e[x]) if(i!=p)

 const int MOD=1e9+,inv2=(MOD+)/;

       double eps=1e-;

       int dx[]={-,,,};

       int dy[]={,,-,};

 int dp[N][N],pre[N][N],a[N],b[N],c[N];

 int read()

 {

    int v=,f=;

    char c=getchar();

    while(c<||<c) {if(c=='-') f=-; c=getchar();}

    while(<=c&&c<=) v=(v<<)+v+v+c-,c=getchar();

    return v*f;

 }

 int main()

 {

     int n=read();

     rep(i,,n) a[i]=read();

     int m=read();

     rep(i,,m) b[i]=read();

     rep(i,,n)

     {

         int mx=,y=;

         rep(j,,m)

         {

             dp[i][j]=pre[i][j]=;

             if(a[i]!=b[j])

             {

                 dp[i][j]=dp[i-][j];

                 pre[i][j]=j;

             }

             if(a[i]>b[j]&&mx<dp[i-][j])

             {

                 mx=dp[i-][j];

                 y=j;

             }

             if(a[i]==b[j])

             {

                 dp[i][j]=mx+;

                 pre[i][j]=y;

             }

         }

     }

     int x=n,y,ans=;

     rep(i,,m)

      if(dp[n][i]>ans)

      {

          ans=dp[n][i];

          y=i;

      }

     printf("%d\n",ans);

     if(ans==) return ;

     int t=;

     while(x)

     {

         if(a[x]==b[y]) c[++t]=b[y];

         y=pre[x][y];

         x--;

     }

     per(i,ans,) printf("%d ",c[i]);

     return ;

 }