#include<stdio.h>
#include<stdlib.h>
int compare(const void *a, const void *b){
    return(*(int*)a-*(int*)b);
}
int main(){
    int n;
    scanf("%d",&n);
    if(n<0){
        printf("Invalid input\n");
        return 0;
    }
    int *priorities=(int*)malloc(n*sizeof(int));
    for(int i=0;i<n;i++){
        scanf("%d",&prioirities[i]);
    }
    qsort(priorities,n,sizeof(int),compare);
    for(int i=0;i<n;i++){
        printf("%d",prioirities[i]);
    }
    printf("\n");
    free(priorities);
    return 0;
}