import java.util.*;
import java.lang.*;
import java.io.*;

public class Main
{
	PrintWriter out = new PrintWriter(System.out);
	BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer tok = new StringTokenizer("");
    String next() throws IOException {
        if (!tok.hasMoreTokens()) { tok = new StringTokenizer(in.readLine()); }
        return tok.nextToken();
    }
    int ni() throws IOException { return Integer.parseInt(next()); }
    long nl() throws IOException { return Long.parseLong(next()); }
  
    void solve() throws IOException {
        int n=ni();
        //ArrayList<Integer>[]A=new ArrayList[n+1];
        ArrayList<Integer>[]B=new ArrayList[n+1];
        for (int x=1;x<=n;x++) B[x]=new ArrayList();
        for (int x=1;x<n;x++) {
            int u=ni(),v=ni();
            B[u].add(x);
            B[v].add(x);
        }
        
        int[]C=new int[n];
        Arrays.fill(C,-1);
        boolean f=false;
        for (int x=1;x<=n;x++) {
            if (B[x].size()<3) continue;
            for (int y=0;y<3;y++) C[B[x].get(y)]=y;
            f=true;
            break;
        }
        
        int p=0;
        if (f) p=3;
        
        for (int x=1;x<n;x++) {
            if (C[x]==-1) { out.println(p); p++; }
            else out.println(C[x]);
        }
        out.flush();
    }
    
    public static void main(String[] args) throws IOException {
        new Main().solve();
    }
}