#include<bits/stdc++.h>
using namespace std;
struct tree
{
    int data;
    struct tree *lc,*rc;
};
int k;
void sorttree(struct tree *&node,int a)
{

    if(node==NULL)
    {
        node=(struct tree *)malloc(sizeof(struct tree));
        node->data=a;
        node->lc=node->rc=NULL;
    }
    else if(a < node->data)
        sorttree(node->lc,a);
    else
        sorttree(node->rc,a);
}
void mid(struct tree *node)
{
    if(node)
    {
        mid(node->lc);
        if(k==0)
        {
            printf("%d",node->data);
            k++;
        }
        else printf(" %d",node->data);
        mid(node->rc);
    }
}
int main()
{
    int n;
    while(~scanf("%d",&n))
    {
        k=0;
        struct tree *root;
        root=NULL;
        while(n--)
        {
            int t;
            scanf("%d",&t);
            sorttree(root,t);
        }
        mid(root);
        printf("\n");
    }
}