#include <stdio.h>
#include <cstdlib>

struct cvor
{
    int val;
    cvor *l, *r;
} *root;

void umetni (cvor **root, cvor *x)
{
    if (*root==NULL)
    {
        *root=x;
        x->l=NULL;
        x->r=NULL;
    }
    else if (x->val < (*root)->val) umetni(&(*root)->l, x);
    else umetni(&(*root)->r, x);
}

int main()
{
    int x;
    while (scanf ("%d", &x));
    {
        int x;
        scanf ("%d", &x);
        cvor *novi=(cvor *)malloc(sizeof (cvor));
        novi->val=x;
        umetni (&root, novi);
    }

    return 0;
}