

import java.util.*;
import java.lang.*;
import java.io.*;
import java.math.*;
import java.text.*;
public class Prac{     
    static class InputReader { 
        private final InputStream stream;
        private final byte[] buf = new byte[8192];
        private int curChar, snumChars;
        public InputReader(InputStream st) {
            this.stream = st;
        } 
        public int read() {
            if (snumChars == -1)
                throw new InputMismatchException();
            if (curChar >= snumChars) {
                curChar = 0;
                try {
                    snumChars = stream.read(buf);
                } 
                catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (snumChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }
        public int ni() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        } 
        public long nl() {
            int c = read();
            while (isSpaceChar(c)) {
            c = read();
            }
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            long res = 0;
            do {
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        } 
        public int[] nia(int n) {
            int a[] = new int[n];
            for (int i = 0; i < n; i++) {
                a[i] = ni();
            }
            return a;
        } 
        public String rs() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            StringBuilder res = new StringBuilder();
            do {
                res.appendCodePoint(c);
                    c = read();
            } while (!isSpaceChar(c));
            return res.toString();
        }
        public String nextLine() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            StringBuilder res = new StringBuilder();
            do {
                res.appendCodePoint(c);
                c = read();
            } while (!isEndOfLine(c));
            return res.toString();
        } 
        public boolean isSpaceChar(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }
 
        private boolean isEndOfLine(int c) {
            return c == '\n' || c == '\r' || c == -1;
        } 
    }
    public static class Key {

        private final int x;
        private final int y;

        public Key(int x, int y) {
            this.x = x;
            this.y = y;
        }

        @Override
        public boolean equals(Object o) {
            if (this == o) return true;
            if (!(o instanceof Key)) return false;
            Key key = (Key) o;
            return x == key.x && y == key.y;
        }

        @Override
        public int hashCode() {
            int result = x;
            result = 31 * result + y;
            return result;
        }

    }
    
    static PrintWriter w = new PrintWriter(System.out);
    static long mod=998244353L,mod1=1000000007;
    static int co[][];
    static void dsort(){
        Arrays.parallelSort(co,(o1,o2)->o1[0]!=o2[0]?o1[0]-o2[0]:o1[1]-o2[1]);
    }
     static long  power(long x, long y) { 
        long temp=0; 
        if( y == 0) 
            return 1; 
        temp = power(x, y/2); 
        if (y%2 == 0) 
            return (temp*temp)%mod1; 
        else
            return (((x*temp)%mod1)*temp)%mod1; 
    } 
    static long modInverse(long a, long m){
        long num=m;
        long x=1;
        long power=a%mod1;
        while(num>0){
              if(num%2==1){
                  x=(x*power)%mod1;
            }
            num>>=1;
            power=(power*power)%mod1;         
        }
        return x;
    }
    static long ncrWithoutMod(int n,int r){
        if(n<r)return 0L;
        long ans=fact[n]/(fact[r]*fact[n-r]);
        return ans;
    }
    static long fact[]=new long[1000005];
    public static void findFact(){
        fact[0]=1;
        for(int i=1;i<=1000000;i++){
            fact[i]=(i*fact[i-1])%mod1;
        }
    } 
    
    static int n;
    static ArrayList<Integer> arr[];
    
    static int ed[][],k=0;
    static Map<Key,Integer> map;
    static void dfs(int i,int p){
        int max=0;
        for(int j:arr[i]){
            if(j!=p){
                dfs(j,i);
            }
        }
        if(p!=-1){
        Key key=new Key(Math.min(i,p),Math.max(i, p));
        map.put(key,k++);
        }
    }
    public static void main (String[] args)throws IOException{
        InputReader sc=new InputReader(System.in);
        n=sc.ni();
        arr=new ArrayList[n+1];
        map=new HashMap<>();
        ed=new int[n-1][2];
        
        for(int i=0;i<=n;i++){
            arr[i]=new ArrayList<>();
            
        }
        for(int i=0;i<n-1;i++){
            int u=sc.ni(),v=sc.ni();
            ed[i][0]=Math.min(u, v);
            ed[i][1]=Math.max(u, v);
            arr[u].add(v);
            
            arr[v].add(u);
        }
        dfs(1,-1);
        for(int i=0;i<n-1;i++){
            w.println(map.get(new Key(ed[i][0],ed[i][1])));
        }
        w.close();
    }
}