#include <bits/stdc++.h>
 
using namespace std;
 
#define cini(x) int x; cin >> x;
void fasterIO()
{
	ios::sync_with_stdio(0);
#ifndef DEBUG
	cin.tie(0);
#endif
}
 
int N, h;
vector<int> t;
 
void push(int i)
{
	for(int j = h; j > 0; --j) {
		int s = i >> j;
		if(t[s] != -1) {
			t[2 * s] = t[s];
			t[2 * s + 1] = t[s];
			t[s] = -1;
		}
	}
}
 
int gett(int i)
{
	i += N;
	int answer = t[i];
	for(; i > 0; i >>= 1) {
		if(t[i] != -1) {
			answer = t[i];
		}
	}
 
	return answer;
}
 
void sett(int l, int r, int v)
{
	l += N;
	r += N;
 
	push(l);
	push(r);
 
	for(int hi = h; l < r; l >>= 1, r >>= 1, --hi) {
		if(l & 1) {
			t[l] = v;
			l++;
		}
		if(r & 1) {
			r--;
			t[r] = v;
		}
	}
}
 
int main()
{
	fasterIO();
 
	int n, m;
	cin >> n >> m;
 
	h = 8 * sizeof(h) - __builtin_clz(n);
	N = 1 << h;
	t.resize(2 * N, 0);
	for(int i = 1; i < N; ++i) {
		t[i] = -1;
	}
 
	while(m-- > 0) {
		cini(a);
		if(a == 1) {
			int l, r, v;
			cin >> l >> r >> v;
			sett(l, r, v);
		}
		else {
			cini(i);
			cout << gett(i) << "\n";
		}
	}
	
	return 0;
}