n, m = map(int, input().split())
edges = [[] for _ in range(n)]
for _ in range(m):
    u, v = map(int, input().split())
    edges[u].append(v)
used = [False] * n
one = False
for i in range(n - 1, -1, -1):
    for v in edges[i]:
        if not used[v]:
            used[i] = True
            break
    if used[i]:
        print("1", end="")
        one = True
    elif one:
        print("0", end="")
print()