#include<bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=a;i<b;i++)




#define rrep(i,a,b) for(int i=a;i>=b;i--)
int N, M;
vector<int> E[101010];
map<pair<int, int>, int> D;
//-----------------------------------------------------------------
int ans[101010];
int vis[101010];
int main() {
	cin >> N >> M;
	rep(i, 0, M) {
		int a, b; scanf("%d%d", &a, &b);
		E[a].push_back(b); E[b].push_back(a);
		D[{a, b}] = D[{b, a}] = i;
	}

	rrep(i, N - 1, 0) {
		bool ok = 0;
		for (int to : E[i]) {
			int j = D[{i, to}];
			if (vis[j]) continue;
			if (i < to) ok = 1;
		}
		if (ok) {
			ans[i] = 1;
			for (int to : E[i]) vis[D[{i, to}]] = 1;
		}
	}

	int f = 0;
	rrep(i, N - 1, 0) {
		if (ans[i]) f = 1;

		if (f == 0) continue;

		if (ans[i]) printf("1");
		else printf("0");
	}
	printf("\n");
}