#include<stdio.h>
int size,top=-1;
int arr[5];
int isFull(){
    if(top==size-1)
    return 1;
    else
    return 0;
}
void enQueue(int num){
    if(isFull()){
        printf("Queue is full");
    }
    else
    arr[++top]=num;
    }

void pos(){
    for(int i=0;i<=top;i++){
        if(arr[i]>0)
        printf("%d",arr[i]);
    }
}
void neg(){
    for(int i=0;i<=top;i++){
        if(arr[i]>0)
        printf("%d",arr[i]);
    }
}
int main(){
    int num,itr;
    scanf("%d",&size);
    if(size<0){
        printf("Invalid input");
        return 0;
    }
    for(itr=1;itr<=size;itr++){
    scanf("%d",&num);
    enQueue();
}
neg();
pos();
return 0;