/*
 * @(#) msu95_c.c - Problem 'C' ("City projection") solution
 * of the ACM Programming Contest at the MSU in 1995.
 * (c) 1997 Ivan Maidanski <ivmai@chat.ru> http://ivmai.chat.ru
 * Freeware program source. All rights reserved.
 **
 * Language: ANSI C
 * Tested with: Borland C++ v3.1
 * Last modified: 1997-10-23 18:40:00 GMT+04:00
 */

/* Input data file: c.dat */

#include <stdio.h>

int n;
int l[100],h[100],r[100];

int height(int x)
{
 int i,maxh=0;
 for (i=0;i<n;i++)
  if (l[i]<=x && r[i]>=x && h[i]>maxh)
   maxh=h[i];
 return maxh;
}

int main()
{
 int x,lh,nh;
 FILE *f=fopen("c.dat","rt");
 n=0;
 while (fscanf(f,"%*[^-0-9]%d%*[^0-9]%d%*[^-0-9]%d",&l[n],&h[n],&r[n])!=EOF)
 {
  if (l[n]>r[n])
  {
   x=l[n];
   l[n]=r[n];
   r[n]=x;
  }
  n++;
 }
 fclose(f);
 for (x=-100,lh=0;x<=100;lh=nh,x++)
  if ((nh=height(x))!=lh)
   printf("%d %d ",x-(nh<lh),nh);
 printf("\n");
 return 0;
}