import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
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 {
        int n;
        ArrayList<int[]>[] a;
        int[] ans;

        public void solve(int testNumber, InputReader in, PrintWriter out) {
            n = in.nextInt();
            if (n <= 3) {
                for (int i = 0; i < n - 1; i++) out.println(i);
                return;
            }
            ans = new int[n - 1];
            for (int i = 0; i < n - 1; i++) ans[i] = -1;
            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;
            boolean set = false;
            for (int i = 0; i < n; i++) {
                if (a[i].size() >= 3) {
                    set = true;
                    for (int j = 0; j < 3; j++) {
                        ans[a[i].get(j)[1]] = c++;
                    }
                }
            }
            if (!set) {
                ans[0] = 0;
                ans[2] = 2;
                ans[1] = 1;
                c = 3;
            }
            for (int i = 0; i < n - 1; i++) {
                if (ans[i] == -1) ans[i] = 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());
        }

    }
}

