boj1933

#1933
import sys
from heapq import *
input = sys.stdin.readline

pts, strt, end, sol = set(), {}, {}, []

for _ in range(int(input())):
    l, h, r = map(int, input().split())
    pts.add(l)
    pts.add(r)
    if l in strt: strt[l].append(h)
    else: strt[l] = [h]
    if r in end: end[r].append(h)
    else: end[r] = [h]

pts = sorted(list(pts))

mxh, hgt, hgt_d = 0, [(0, 0)], []
for p in pts:
    if p in strt:
        for h in strt[p]:
            heappush(hgt, (-h, h))
    if p in end:
        for h in end[p]:
            heappush(hgt_d, (-h, h))

    tmp = []
    while 1:
        if not hgt_d : break
        if hgt[0]!= hgt_d[0] : break
        tmp.append(heappop(hgt))
        heappop(hgt_d)

    n_mxh = hgt[0]

    for itm in tmp:
        heappush(hgt, itm)
        heappush(hgt_d, itm)

    if n_mxh != mxh:
        sol.extend([p, n_mxh[1]])
        mxh = n_mxh

print(' '.join(map(str, sol)))