#include<stdio.h>
int main(){
    int n1,n2;
    
    scanf("%d",&n1);
    if(n1 <= 0){
        printf("Invalid Input");
        return 0;
    }
    int arr1[n1];
    for(int i=0;i<n1;i++)
        scanf("%d",&arr1[i]);
        
    scanf("%d",&&n2);
    if(n2 <= 0){
        printf("Invalid input");
        return 0;
    }
    int arr2[n2];
    for(int i=0;i<n2;i++)
        scanf("%d"&arr2[i]);
    int merged[n1 + n2];
    for(int i=0;i<n1;i++)
        merged[i]=arr1[i];
    for(int i=0;i<n2;i++)
        merged[n1 + i]=arr2[i];
    for(int i=0;i<n1+n2-1;i++){
        for(int j=0;j<n1+n2-i-1;j++){
            if(merged[j]>merged[j+1]){
                int temp =merged[j];
                merged[j]=merged[j+1];
                merged[j+1]=temp;
            }
        }
    }
    for(int i=0;i<n1+n2;i++)
        printf("%d",merged[i]);
    
    return 0;
    
}