#include<stdio.h>
void mergeArrays(int * a1,int n1,int *a2,int n2, int *merged) {
    int i=0,j=0,k=0;
    while(i < n1 && j < n2) {
        if (*(a1+i) <= *(a2 + j)) {
            *(merged+k) = *(a1 + i);
            i++;
        }
        else {
            *(merged+k) = *(a1 +i);
            j++;
        }
        k++;
    }
    while(i<n1) {
        *(merged+k) = *(a1 + i);
        i++;
        k++;
    }
    while(j<n2) {
    *(merged+k) =*(a2 + j);
    i++;
    k++;
    }
}
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",&arr[i]);
    }
    scanf("%d",&N2);
    if(N2<=0) {
        printf("Invalid input");
        return 0;
    }
    int arr[N2];
    for(int i=0;i<N2;i++) {
        scanf("%d",arr2[i]);
    }
    int merged[N1+N2];
    mergeArrays(arr1,N1,arr2,N2,merged);
    for(int i=0;i<N1+N2;i++) {
        printf("%d",merged[i]);
    }
    return 0;
    }