import java.io.PrintWriter;
import java.util.*;
import java.util.concurrent.SynchronousQueue;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		ArrayList<Integer>[] g = new ArrayList[n];
		for (int i = 0; i < n; ++i)
			g[i] = new ArrayList<>();
		int[] a = new int[m];
		int[] b = new int[m];
		boolean[] used = new boolean[n];
		for (int i = 0; i < m; ++i) {
			a[i] = sc.nextInt();
			b[i] = sc.nextInt();
			g[a[i]].add(b[i]);
			g[b[i]].add(a[i]);
		}
		for (int i = n - 1; i >= 0; --i) {
			boolean f = true;
			for (int dst : g[i]) {
				if (dst > i && !used[dst]) {
					f = false;
					break;
				}
			}
			if (!f) {
				used[i] = true;
			}
		}
		boolean f = false;
		PrintWriter pw=new PrintWriter(System.out);
		for (int i = n - 1; i >= 0; --i) {
			if (!f && !used[i])
				continue;
			else
				f = true;
			pw.print(used[i] ? 1 : 0);
		}
		pw.println();
		pw.close();
	}

	static void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}
}