local n, m = io.read("*n", "*n")
local line = {}
for i = 1, n do
  line[i] = {}
  line[i].l = {}
  line[i].score = -1
end
for i = 1, m do
  local a, b = io.read("*n", "*n")
  a, b = a + 1, b + 1
  table.insert(line[a].l, b)
  table.insert(line[b].l, a)
end

local function getmax(curmax)
  for i = curmax, 1, -1 do
    if line[i].score == -1 then
      return i
    end
  end
  return 0
end

local curmax = n

while 0 < curmax do
  line[curmax].score = 0
  for i = 1, #line[curmax].l do
    local dstidx = line[curmax].l[i]
    line[dstidx].score = 1
  end
  curmax = getmax(curmax)
end
local max1 = 1
for i = n, 1, -1 do
  if line[i].score == 1 then
    max1 = i
    break
  end
end
for i = max1, 1, -1 do
  io.write(line[i].score)
end
io.write("\n")