// editor4
#include<stdio.h>
#include<stdlib.h>

typedef struct tree
{
    int data;
    struct tree *left,*right;
}node;

node *create (int n)
{
    node*nd=(node*)malloc(sizeof(node));
    nd->data=n;
    nd->left=nd->right=NULL;
    return nd;
}

node *ins(int n, node*root)
{
    if(root==NULL)
    {
        return create(n);
    }
    if(n<root->data)
    {
        root->left=ins(n,root->left);
    }
    else
    {
        root->right(ins(n,root->right));
        return root;
    }
    
}

void in(node *root)
{
    if(root==NULL)
    {
        return;
    }
    in(root->left);
    in(root->right);
    printf("%d",root->data);
    
}

int main(){
    int size,n,i;
    scanf("%d",&size);
    if(size<0)
    {
        printf("Invaliid input");
    }
    for(i=0;i<size;i++)
    {
        scanf("%d",&n);
        root=ins(n,root);
        
    }
    in(root);
    
}