class UnionFind
  def initialize(n)
    @size = Array.new(n, 1)
    @parent = []

    n.times do |i|
      @parent[i] = i
    end
  end

  def find(x)
    if @parent[x] == x
      x
    else
      @parent[x] = find(@parent[x])
    end
  end

  def unite(x, y)
    x = find(x)
    y = find(y)
    return if x == y

    @parent[y] = x
    @size[x] += @size[y]
  end

  def same(x, y)
    find(x) == find(y)
  end

  def size(x)
    @size[find(x)]
  end
end

N, M = gets.chomp.split.map(&:to_i)
uf = UnionFind.new(N)

M.times do
  a, b = gets.chomp.split.map { |i| i.to_i - 1 }.sort
  next if uf.find(a) == uf.find(b)

  if uf.size(a) > uf.size(b)
    uf.unite(a, b)
  elsif uf.size(a) < uf.size(b)
    uf.unite(b, a)
  else
    if uf.find(a) < uf.find(b)
      uf.unite(a, b)
    else
      uf.unite(b, a)
    end
  end
end

N.times do |i|
  puts uf.find(i) + 1
end