import java.io.*;
import java.util.*;
 
 
public class idk {
    public static void main(String[] args) throws Exception {
    	FastReader in = new FastReader();
        int n=in.nextInt();
        int[][] uv = in.next2Dint(n-1);
        if (n<=3) {
            for (int i = 0; i < n - 1; i++) {
                System.out.println(i);
            }
            return;
        }
 
        ArrayList<ArrayList<Integer>> conni = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            conni.add(new ArrayList<>());
        }
        for (int i = 0; i < n - 1; i++) {
            conni.get(uv[i][0]-1).add(i);
            conni.get(uv[i][1]-1).add(i);
        }
        int[] values = new int[n];
        ArrayList<Integer> vals = new ArrayList<>();
        for (ArrayList<Integer> integers : conni) {
            if (integers.size() >= 3) {
                for (int i = 0; i < 3; i++) {
                    values[integers.get(i)]=i;
                    vals.add(integers.get(i));
                }
                break;
            }
        }
        int ct = vals.size();
        StringBuilder b = new StringBuilder();
        for (int i = 0; i < n-1; i++) {
            if (!vals.contains(i)) {
                b.append(ct);
                ct++;
            } else {
                b.append(values[i]);
            }
            b.append('\n');
        }
 
        System.out.print(b.toString());
    }
 
    public static class FastReader {
        private BufferedReader br;
        private StringTokenizer st;
 
        public FastReader() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }
 
        public FastReader(String filename) throws IOException {
            br = new BufferedReader(new FileReader(filename + ".in"));
        }
 
        public FastReader(BufferedReader reader) {
            br = reader;
        }
 
        public BufferedReader getReader() {
            return br;
        }
 
        public StringTokenizer getStringTokenizer() {
            return st;
        }
 
        public String next() throws IOException {
            while (st == null || !st.hasMoreTokens()) {
                String s = br.readLine();
                if (s == null) return null;
                st = new StringTokenizer(s);
            }
            return st.nextToken();
        }
 
        public int nextInt() throws IOException {
            return Integer.parseInt(next());
        }
 
        public long nextLong() throws IOException {
            return Long.parseLong(next());
        }
 
        public double nextDouble() throws IOException {
            return Double.parseDouble(next());
        }

        public boolean lineHasNext() throws IOException {
            if (st == null) {
                String s = br.readLine();
                if (s == null) return false;
                st = new StringTokenizer(s);
            }
            return st.hasMoreTokens();
        }

        public boolean hasNext() throws IOException {
            while (st == null || !st.hasMoreTokens()) {
                String s = br.readLine();
                if (s == null) return false;
                st = new StringTokenizer(s);
            }
            return true;
        }

        public void skipLine() throws IOException {
            if (st == null || !st.hasMoreTokens()) {
                br.readLine(); // Otherwise, would do nothing.
            }
            st = null;
        }

        public String[] nextLine() throws IOException {
            String s = br.readLine();
            if (s == null) return null;
            st = new StringTokenizer(s);
            ArrayList<String> result = new ArrayList<>();
            while (st.hasMoreTokens()) {
                result.add(st.nextToken());
            }
            st = null;
            return result.toArray(new String[0]);
        }

        public String[] nextTower(int lines) throws IOException {
            String[] tower = new String[lines];
            st = null;
            for (int i = 0; i < lines; i++) {
                tower[i] = br.readLine();
            }
            return tower;
        }
 
        public int[] nextIntLine() throws IOException {
            return intArr(nextLine());
        }
 
        public long[] nextLongLine() throws IOException {
            return longArr(nextLine());
        }
 
        public int[] nextIntTower(int lines) throws IOException {
            return intArr(nextTower(lines));
        }
 
        public long[] nextLongTower(int lines) throws IOException {
            return longArr(nextTower(lines));
        }
 
        public int[] intArr(String[] strings) throws IOException {
            int[] ints = new int[strings.length];
            int i = 0;
            for (String s : strings) {
                ints[i] = Integer.parseInt(s);
                i++;
            }
            return ints;
        }
 
        public long[] longArr(String[] strings) throws IOException {
            long[] longs = new long[strings.length];
            int i = 0;
            for (String s : strings) {
                longs[i] = Long.parseLong(s);
                i++;
            }
            return longs;
        }
 
        public double[] doubleArr(String[] strings) {
            double[] doubles = new double[strings.length];
            int i = 0;
            for (String s : strings) {
                doubles[i] = Double.parseDouble(s);
                i++;
            }
            return doubles;
        }

        public char[] nextCharArray() throws IOException {
            st = null;
            String s = br.readLine();
            return s == null ? null : s.toCharArray();
        }

        public boolean[] nextBoolArray(char c) throws IOException {
            char[] chars = nextCharArray();
            if (chars == null) return null;
            boolean[] booleans = new boolean[chars.length];
            for (int i = 0; i < chars.length; i++) {
                booleans[i] = chars[i] == c;
            }
            return booleans;
        }
 
        public int[][] next2Dint(int lines) throws IOException {
            int[][] result = new int[lines][];
            for (int i = 0; i < lines; i++) {
                result[i] = nextIntLine();
            }
            return result;
        }
 
        public long[][] next2Dlong(int lines) throws IOException {
            long[][] result = new long[lines][];
            for (int i = 0; i < lines; i++) {
                result[i] = nextLongLine();
            }
            return result;
        }
 
        public char[][] next2Dchar(int lines) throws IOException {
            char[][] result = new char[lines][];
            for (int i = 0; i < lines; i++) {
                result[i] = nextCharArray();
            }
            return result;
        }
 
        public boolean[][] next2Dbool(int lines, char c) throws IOException {
            boolean[][] result = new boolean[lines][];
            for (int i = 0; i < lines; i++) {
                result[i] = nextBoolArray(c);
            }
            return result;
        }
    }
}