n,m = map(int,input().split())
g = [[] for _ in range(n)]

for i in range(m):
    a,b = map(int,input().split())
    g[a].append(b)
    g[b].append(a)

r = [0]*n
for v in range(n)[::-1]:
    for c in g[v]:
        if v < c and r[c]==0:
            r[v] = 1

while r[-1]==0: r.pop()
print("".join(map(str,r))[::-1])