#include<stdio.h>
int main()
{
    int n1,n2;
    scanf("%d",&n1);
    if(n1<=)
    {
        printf("Invalid input");
        return 0;
    }
    int a[n1];
    for(int i=0;i<n1;i++) scanf("%d",&a[i]);
    scanf("%d",&n2);
    if(n2<=0)
    {
        printf("Invalid input");
        return 0;
    }
    int b[n2];
    for(int i=0;i<n2;i++) scanf("%d",&b[i]);
    int i=0;j=0;
    while(i<n1&&j<n2){
        if(*(a+i)<*(b+j))
        printf("%d",*(a+i++));
        else
        printf("%d",*(b+j++));
    }
    while(i<n1) printf("%d",*(a+i++));
    while(j<n2) printf("%d",*(b+j++));
    return 0;
    
}