#input of int(split by space)
def get_i()
  return gets.chomp.split(" ").map(&:to_i)
end
#input of float(split by space)
def get_f()
  return gets.chomp.split(" ").map(&:to_f)
end
#input of string(split by space)
def get()
  return gets.chomp.split(" ")
end
#input of string(split per one character)
def get_nsp()
  return gets.chomp.split("")
end
#yes or no decision
def yn_judge(bool,y="Yes",n="No")
  return bool ? y : n 
end
#create of array
def array(size1,init=nil,size2=-1)
  if size2==-1
      return Array.new(size1){init}
  else
      return Array.new(size2){Array.new(size1){init}}
  end
end

def max(a,b)
    return a>b ? a : b
end

def min(a,b)
    return a>b ? b : a
end

INF=Float::INFINITY

N=gets.to_i
def bfs(g)
  color=array(N-1,-1)
  color[0]=1
  que=[0]
  until que==[]
    p=que.shift
    c=1
    g[p].each do|v|
        next unless color[v]==-1
        c+=1 if color[p]==c
        color[v]=c
        c+=1
        que.push(v)
    end
  end
  return color
end
g=Array.new(N){[]}
(N-1).times do|i|
  a,b=get_i.map{|x| x-=1}
  g[a].push(b)
  g[b].push(a) 
end
color=bfs(g)
puts color.max
puts color.join("\n")