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

    i=0;
    while(i<n1&&j<n2) printf("%d",a[i]<b[j]?a[i++]:b[j++]);
    while(i<n1)printf("%d",a[i+++]);
    while(j<n2)printf("%d",b[j+++]);
}