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

public class Main {

    public static void main(String[] args) throws IOException {
        // write your code here
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        StringTokenizer st;
        try {
            int n = Integer.parseInt(br.readLine());
            int edgeStart[] = new int[n];
            int edgeEnd[] = new int[n];
            int degree[] = new int[n + 1];
            int edgeVal[] = new int[n];

            Arrays.fill(edgeVal, -1);

            for(int i = 1;i < n;i++){
                st = new StringTokenizer(br.readLine());
                int u = Integer.parseInt(st.nextToken());
                int v = Integer.parseInt(st.nextToken());

                edgeStart[i] = u;
                edgeEnd[i] = v;
                degree[u]++;
                degree[v]++;
            }

            HashSet<Integer>leaves = new HashSet<>();

            for(int i = 1;i <= n;i++){
                if(degree[i] == 1){
                    leaves.add(i);
                }
            }

            int val = 0;

            for(int i = 1;i < n;i++){
                if(leaves.contains(edgeStart[i]) || leaves.contains(edgeEnd[i])){
                    edgeVal[i] = val;
                    ++val;
                }
            }

            for(int i = 1;i < n;i++){
                if(edgeVal[i] == -1){
                    edgeVal[i] = val;
                    ++val;
                }
            }

            StringBuilder sb = new StringBuilder();

            for(int i = 1;i < n;i++){
                sb.append(edgeVal[i]);
                sb.append('\n');
            }

            System.out.println(sb);

        } catch (IOException ioe) {
            throw ioe;
        }

    }
}

