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