import java.io.*;
import java.util.*;
public class Mextree
{

	public static void main(String args[])throws IOException
	{
			ArrayList<Integer>adj[];
	HashMap<String,Integer>map = new HashMap<>();
	String edge[];
			BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
			PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
			int n = Integer.parseInt(br.readLine());
			edge = new String[n-1];
			adj = (ArrayList<Integer>[]) new ArrayList[n+1];
			for(int i=0;i<=n;i++)
				adj[i] = new ArrayList<Integer>();
			for(int i=0;i<n-1;i++)
			{
				String s = br.readLine();
				StringTokenizer st = new StringTokenizer(s);
				edge[i] = s;
				int u = Integer.parseInt(st.nextToken());
				int v = Integer.parseInt(st.nextToken());
				adj[u].add(v);
				adj[v].add(u);
			}
			int label2=n-2,label=0,ind=-1;
			boolean flag = false;
			for(int i=1;i<=n;i++)
			{
				if(adj[i].size()>2)
				{
					ind = i;
					for(int j=0;j<adj[i].size();j++)
					{
						String s = i + " "+adj[i].get(j);
						String s1 = adj[i].get(j) + " "+i;
						map.put(s,label);
						map.put(s1,label);
						label++;
						//adj[adj[i].get(j)].remove(adj[adj[i].get(j)].indexOf(i));
					}

				}
				if(ind!=-1)
					break;
			}
			for(int i=1;i<=n;i++)
			{
				if(ind!=i)
				{
					
					for(int j=0;j<adj[i].size();j++)
					{
						String s = i + " "+adj[i].get(j);
						String s1 = adj[i].get(j) + " "+i;
						if(!map.containsKey(s)){
						map.put(s,label);
						map.put(s1,label);
						label++;}
						//adj[adj[i].get(j)].remove(adj[adj[i].get(j)].indexOf(i));
					}
				}
			}
			for(int i=0;i<n-1;i++)
			{
				out.println(map.get(edge[i]));
			}
			out.close();
	} 
}