n, m = read_line.split.map &.to_i
g = Array.new(n) { [] of Int32 }
m.times do
  u, v = read_line.split.map &.to_i
  g[u] << v
  g[v] << u
end

flag = [false] * n
(n - 1).to(0) do |i|
  next if flag[i]
  g[i].each do |v|
    flag[v] = true
  end
end

ans = flag.reverse.join { |f| f ? '1' : '0' }
puts ans[ans.index('1').not_nil!..]