#!/usr/bin/env python3
# %%
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines


# %%
N, M = map(int, readline().split())
m = map(int, read().split())
AB = zip(m, m)

# %%
G = [[] for _ in range(N)]
for a, b in AB:
    if a > b:
        a, b = b, a
    G[b].append(a)


# %%
buy = [False] * N
for n in range(N - 1, -1, -1):
    if buy[n]:
        continue
    for v in G[n]:
        buy[v] = True

# %%
while not buy[-1]:
    buy.pop()
print(''.join('1' if bl else '0' for bl in buy[::-1]))