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>
using namespace std;

struct RU {
	using type1 = int;
	using type2 = int;
	static type1 id1() { return INT_MAX; }
	static type2 id2() { return -1; }
	static type1 op1(const type1& l, const type1& r) { return min(l, r); }
	static type1 op2(const type1& l, const type2& r) { return r == -1 ? l : r; }
	static type2 op3(const type2& l, const type2& r) { return r == -1 ? l : r; }
};

template <typename M>
class LazySegmentTree {
	using T1 = typename M::type1;
	using T2 = typename M::type2;
	const int n;
	vector<T1> data;
	vector<T2> lazy;
	int size(int n) {
		int res = 1;
		while (res < n) res <<= 1;
		return res;
	}
	void push(int node) {
		if (lazy[node] == M::id2()) return;
		if (node < n) {
			lazy[node * 2] = M::op3(lazy[node * 2], lazy[node]);
			lazy[node * 2 + 1] = M::op3(lazy[node * 2 + 1], lazy[node]);
		}
		data[node] = M::op2(data[node], lazy[node]);
		lazy[node] = M::id2();
	}
	void suc(int l, int r, int node, int lb, int ub, T2 val) {
		if (ub <= l || r <= lb) return;
		if (l <= lb && ub <= r) {
			lazy[node] = M::op3(lazy[node], val);
			return;
		}
		push(node);
		int c = (lb + ub) / 2;
		suc(l, r, node * 2, lb, c, val);
		suc(l, r, node * 2 + 1, c, ub, val);
		data[node] = M::op1(M::op2(data[node * 2], lazy[node * 2]), M::op2(data[node * 2 + 1], lazy[node * 2 + 1]));
	}
	T1 sub(int l, int r, int node, int lb, int ub) {
		if (ub <= l || r <= lb) return M::id1();
		if (l <= lb && ub <= r) return M::op2(data[node], lazy[node]);
		push(node);
		int c = (lb + ub) / 2;
		return M::op1(sub(l, r, node * 2, lb, c), sub(l, r, node * 2 + 1, c, ub));
	}
public:
	LazySegmentTree(int n_) : n(size(n_)), data(n * 2, M::id1()), lazy(n * 2, M::id2()) {}
	void update(int l, int r, T2 val) {
		suc(l, r + 1, 1, 0, n, val);
	}
	T1 find(int l, int r) {
		return sub(l, r + 1, 1, 0, n);
	}
};

int main()
{
	ios::sync_with_stdio(false), cin.tie(0);
	int n, q, type, s, t, x;
	cin >> n >> q;
	LazySegmentTree<RU> lst(n);
	while (q--) {
		cin >> type;
		if (type) {
			cin >> x;
			printf("%d\n", lst.find(x, x));
		}
		else {
			cin >> s >> t >> x;
			lst.update(s, t, x);
		}
	}
	return 0;
}