import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;

public class _479 {
	public static void main(String[] args) throws IOException {
		new _479().solve();
	}

	void solve() throws IOException {
		try (final Scanner in = new Scanner(System.in)) {
			int n = in.nextInt();
			int m = in.nextInt();
			List<Integer>[] g = new List[n];
			for (int i = 0; i < n; i++) g[i] = new ArrayList<>();
			int[] cnt = new int[n];
			for (int i = 0; i < m; i++) {
				int a = in.nextInt();
				int b = in.nextInt();
				cnt[a < b ? a : b]++;
				if (a < b) g[b].add(a);
				else g[a].add(b);
			}
			char[] cs = new char[n];
			Arrays.fill(cs, '0');
			for (int i = n-1; i >= 0; i--) if (cnt[i] != 0) {
				for (int t : g[i]) cnt[t]--;
				cs[n-1-i] = '1';
			}
			for (int i = 0; i < n; i++) {
				if (cs[i] != '0' || i == n - 1) {
					System.out.println(new String(cs, i, cs.length - i));
					return;
				}
			}
		}
	}
	
	// for debug
	static void dump(Object... o) {
		System.err.println(Arrays.deepToString(o));
	}
}