import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Collection;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.StringTokenizer;
import java.util.Queue;
import java.io.BufferedReader;
import java.util.LinkedList;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author Jaynil
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        TaskC solver = new TaskC();
        solver.solve(1, in, out);
        out.close();
    }

    static class TaskC {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int n = in.nextInt();
            int ans[] = new int[n - 1];
            ArrayList<int[]> a[] = new ArrayList[n];
            for (int i = 0; i < n; i++) a[i] = new ArrayList<int[]>();
            for (int i = 0; i < n - 1; i++) {
                int u = in.nextInt() - 1;
                int v = in.nextInt() - 1;
                a[u].add(new int[]{v, i});
                a[v].add(new int[]{u, i});
            }
            int c = 0;
            Queue<Integer> q = new LinkedList<>();
            HashSet<Integer> vis = new HashSet<>();
            q.add(0);
            while (q.size() > 0) {
                int r = q.poll();
                if (vis.contains(r)) continue;
                vis.add(r);
                for (int t[] : a[r]) {
                    if (!vis.contains(t[0])) {
                        q.add(t[0]);
                        ans[t[1]] = c;
                        c++;
                    }
                }
            }
            for (int i = 0; i < n - 1; i++) {
                out.println(ans[i]);
            }
        }

    }

    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

    }
}

