#include<stdio.h>
int main(){
    int n;
    scanf("%d",&n);
    if(n<0){
        printf("Invalid input");
        return 0;
    }
    int stack[20];
    int temp[20];
    int top=-1, temptop=-1;
    for(int i=0; i<n; i++){
        scanf("%d",&stack[i]);
        top++;
    }
    while(top!=-1){
        int curr=stack[top--];
        while(temptop != -1 && temp[top]>curr){
            stack[++top]=temp[temptop--];
        }
        temp[++temptop]=curr;
    }
    while(temptop !=-1){
        stack[++top]=temp[temptop--];
    }
    for(int i=top; i>=0; i--){
        printf("%d",stack[i]);
    }
    
    return 0;
}