"use strict";
var GET=(function(){function f(s){return new g(s);}function g(s){this._s=s.trim().split("\n");this._y=0;}g.prototype.a=function(f){var s=this._s, y=this._y, r;if(typeof s[y]==="string")s[y]=s[y].split(" ").reverse();r=s[y].pop();if(!s[y].length)this._y++;return f?r:+r;};g.prototype.l=function(f){var s=this._s[this._y++].split(" ");return f?s:s.map(a=>+a);};g.prototype.m=function(n,f){var r=this._s.slice(this._y,this._y+=n).map(a=>a.split(" "));return f?r:r.map(a=>a.map(a=>+a));};g.prototype.r=function(n,f){var r=this._s.slice(this._y,this._y+=n);return f?r:r.map(a=>+a);};return f;})();
var o=GET(require("fs").readFileSync("/dev/stdin","utf8"));
function xArray(v){var a=arguments,l=a.length,r="Array(a["+--l+"]).fill(0).map(x=>{return "+v+";})";while(--l)r="Array(a["+l+"]).fill(0).map(x=>"+r+")";return eval(r);}

console.log(main());
function main(){
  var n = o.a();
  var a = o.m(n-1);
  for(var i = 0; i < n-1; i++){
    a[i][0]--, a[i][1]--;
    a[i][2] = i;
  }
  var mx = 1;
  var set = xArray("new Set()",n);
  a.sort((a,b)=>a[0]-b[0]);
  a[0][3] = 1;
  set[a[0][0]].add(1);
  set[a[0][1]].add(1);
  var id = 0, k = 2;
  for(var i = 1; i < n-1; i++){
    var u = a[i][0], v = a[i][1];
    if(u !== id)k = 1, id = u;
    while(set[u].has(k)||set[v].has(k))k++;
    if(mx < k)mx = k;
    a[i][3] = k;
    set[u].add(k);
    set[v].add(k);
  }
  a.sort((a,b)=>a[2]-b[2]);
  var ans = Array(n-1);
  for(var i = 0; i < n-1; i++){
    ans[i] = a[i][3];
  }
  console.log(mx);
  return ans.join("\n");
}