Hooray! Berl II, the king of Berland is making a knight tournament. The king has already sent the message to all knights in the kingdom and they in turn agreed to participate in this grand event.

As for you, you're just a simple peasant. There's no surprise that you slept in this morning and were late for the tournament (it was a weekend, after all). Now you are really curious about the results of the tournament. This time the tournament in Berland went as follows:  There are n knights participating in the tournament. Each knight was assigned his unique number — an integer from 1 to n.  The tournament consisted of m fights, in the i-th fight the knights that were still in the game with numbers at least l_{i} and at most r_{i} have fought for the right to continue taking part in the tournament.  After the i-th fight among all participants of the fight only one knight won — the knight number x_{i}, he continued participating in the tournament. Other knights left the tournament.  The winner of the last (the m-th) fight (the knight number x_{m}) became the winner of the tournament. 

You fished out all the information about the fights from your friends. Now for each knight you want to know the name of the knight he was conquered by. We think that the knight number b was conquered by the knight number a, if there was a fight with both of these knights present and the winner was the knight number a.

Write the code that calculates for each knight, the name of the knight that beat him.


-----Input-----

The first line contains two integers n, m (2 ≤ n ≤ 3·10^5; 1 ≤ m ≤ 3·10^5) — the number of knights and the number of fights. Each of the following m lines contains three integers l_{i}, r_{i}, x_{i} (1 ≤ l_{i} < r_{i} ≤ n; l_{i} ≤ x_{i} ≤ r_{i}) — the description of the i-th fight.

It is guaranteed that the input is correct and matches the problem statement. It is guaranteed that at least two knights took part in each battle.


-----Output-----

Print n integers. If the i-th knight lost, then the i-th number should equal the number of the knight that beat the knight number i. If the i-th knight is the winner, then the i-th number must equal 0.


-----Examples-----
Input
4 3
1 2 1
1 3 3
1 4 4

Output
3 1 4 0 
Input
8 4
3 5 4
3 7 6
2 8 8
1 8 1

Output
0 8 4 6 4 8 6 1 


-----Note-----

Consider the first test case. Knights 1 and 2 fought the first fight and knight 1 won. Knights 1 and 3 fought the second fight and knight 3 won. The last fight was between knights 3 and 4, knight 4 won.

```python

USER_FILENAME = "<user_code>"
import sys, json, builtins
import math, heapq, bisect, itertools, functools, collections, statistics, fractions, decimal, operator, array, random, re, string, os, pathlib
try:
    import resource as _res
except Exception:
    _res = None
from collections import Counter, defaultdict, deque, OrderedDict
from functools import lru_cache, reduce
from itertools import accumulate, permutations, combinations, product
from math import gcd, ceil, floor, sqrt
from decimal import Decimal
try:
    from typing import *
except Exception:
    pass
try:
    sys.setrecursionlimit(1_000_000)
except Exception:
    pass
try:
    import site as _site
    try:
        _sys_sites = _site.getsitepackages() if hasattr(_site, "getsitepackages") else []
        for _p in _sys_sites:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
    try:
        _usp = _site.getusersitepackages()
        if isinstance(_usp, str):
            _usp = [_usp]
        for _p in _usp:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
except Exception:
    pass

ns = {"__name__": "__main__"}
for _k, _v in list(globals().items()):
    if not _k.startswith("_"):
        ns[_k] = _v
_CODE = 'from sys import stdin, stdout, setrecursionlimit\nfrom collections import deque, defaultdict, Counter\nfrom heapq import heappush, heappop\nimport math\n\nrl = lambda: stdin.readline()\nrll = lambda: stdin.readline().split()\nrli = lambda: map(int, stdin.readline().split())\nrlf = lambda: map(float, stdin.readline().split())\n\nINF, NINF = float(\'inf\'), float(\'-inf\')\n\nclass SegTree:\n\tdef __init__(self, size):\n\t\tself.n = size\n\t\tself.T = [[INF, INF] for _ in range(4*self.n)]\n\n\tdef _update_range(self, v, tl, tr, l, r, val):\n\t\tif l > r or tl > tr: return\n\t\t# print(f"l, r = {l, r}, tl, tr = {tl, tr}")\n\t\tif l == tl and r == tr:\n\t\t\t# self.T[v].append(val)\n\t\t\tif self.T[v] == [INF, INF]:\n\t\t\t\tself.T[v] = val\n\t\telse:\n\t\t\tmid = (tl + tr)//2\n\t\t\tself._update_range(2*v, tl, mid, l, min(r, mid), val)\n\t\t\tself._update_range(2*v+1, mid+1, tr, max(l, mid+1), r, val)\n\n\tdef update_range(self, l, r, val):\n\t\tself._update_range(1, 0, self.n-1, l, r, val)\n\n\n\tdef qry(self, index):\n\t\treturn self._qry(1, 0, self.n-1, index)\n\n\tdef _qry(self, v, tl, tr, index):\n\t\tif tl == tr:\n\t\t\tif self.T[v]:\n\t\t\t\treturn self.T[v]\n\t\t\telse:\n\t\t\t\treturn (INF, INF)\n\t\telse:\n\t\t\tmid = (tl + tr)//2\n\t\t\tcurr_x, curr_time = INF, INF\n\t\t\tif self.T[v]:\n\t\t\t \tcurr_x, curr_time = self.T[v]\n\t\t\tif index <= mid:\n\t\t\t\tprev_x, prev_time = self._qry(2*v, tl, mid, index)\n\t\t\telse:\n\t\t\t\tprev_x, prev_time = self._qry(2*v+1, mid+1, tr, index)\n\t\t\tif curr_time < prev_time:\n\t\t\t\treturn (curr_x, curr_time)\n\t\t\telse:\n\t\t\t\treturn (prev_x, prev_time)\n\ndef main():\n\t# n = number of knights\n\t# m = number of fights\n\tn, m = rli()\n\tans = [0 for _ in range(n)]\n\tST = SegTree(n)\n\tfor time in range(m):\n\t\tl, r, x = rli()\n\t\tl -= 1\n\t\tr -= 1\n\t\tx -= 1\n\t\tST.update_range(l, x-1, (x, time))\n\t\tST.update_range(x+1, r, (x, time))\n\n\tfor i in range(n):\n\t\tk, _ = ST.qry(i)\n\t\tans[i] = k + 1 if k < INF else 0\n\tprint(" ".join(str(x) for x in ans))\n\tstdout.close()\n\ndef __starting_point():\n\tmain()\n__starting_point()'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

```

Measured memory_bytes: