Problem: Write a program which manipulates a sequence A = {a0, a1, . . . , an−1} with the following operations:

* update(s, t, x): change as, as+1, ..., at to x.
* find(i): output the value of ai.



Note that the initial values of ai (i = 0, 1, . . . , n−1) are 231-1.

Constraints

* 1 ≤ n ≤ 100000
* 1 ≤ q ≤ 100000
* 0 ≤ s ≤ t < n
* 0 ≤ i < n
* 0 ≤ x < 231−1

Input


n q
query1
query2
:
queryq


In the first line, n (the number of elements in A) and q (the number of queries) are given. Then, ith query queryi is given in the following format:


0 s t x


or


1 i


The first digit represents the type of the query. '0' denotes update(s, t, x) and '1' denotes find(i).

Output

For each find operation, print the value.

Examples

Input

3 5
0 0 1 1
0 1 2 3
0 2 2 2
1 0
1 1


Output

1
3


Input

1 3
1 0
0 0 0 5
1 0


Output

2147483647
5

Solution (in CPP):

Solution:
#include<bits/stdc++.h>
#define int long long
#define for0(i, n) for(int i = 0; i < (n); i++)
#define mp make_pair
using namespace std;
int t, n, q, l = 0, r = 123456, x = 2147483647, q1;
pair<int, int>t1[123456], t2[12345], t3[1234], t4[123], t5[12];
void f1() {
	r++;
	while (l < r) {
		if (l % 10000 == 0 && l + 10000 <= r) {
			t5[l / 10000] = mp(t, x);
			l += 10000;
		}
		else if (l % 1000 == 0 && l + 1000 <= r) {
			t4[l / 1000] = mp(t, x);
			l += 1000;
		}
		else if (l % 100 == 0 && l + 100 <= r) {
			t3[l / 100] = mp(t, x);
			l += 100;
		}
		else if (l % 10 == 0 && l + 10 <= r) {
			t2[l / 10] = mp(t, x);
			l += 10;
		}
		else {
			t1[l] = mp(t, x); l++;
		}
	}
}
int f2(int i) {
	int t = t1[i].first, x = t1[i].second;
	i /= 10;
	if (t < t2[i].first) {
		t = t2[i].first; x = t2[i].second;
	}
	i /= 10;
	if (t < t3[i].first) {
		t = t3[i].first; x = t3[i].second;
	}
	i /= 10;
	if (t < t4[i].first) {
		t = t4[i].first; x = t4[i].second;
	}
	i /= 10;
	if (t < t5[i].first) {
		t = t5[i].first; x = t5[i].second;
	}
	return x;
}
signed main() {
	cin >> n >> q;
	for0(i, n)t1[i] = mp(0, x);
	for (t = 1; t <= q; t++) {
		cin >> q1;
		if (q1) {
			int i; cin >> i; cout << f2(i) << endl;
		}
		else {
			cin >> l >> r >> x;	f1();
		}
	}
}