# Legends Always Come Up with Solution
# Author: Manvir Singh

import os
from io import BytesIO, IOBase
import sys
from collections import defaultdict,deque,Counter
from bisect import *
import sys
def main():
    n = int(input())
    tree = defaultdict(list)
    b = []
    c = set()
    for i in range(n - 1):
        x, y = map(int, input().split())
        tree[x].append(y)
        tree[y].append(x)
        c.add((x, y))
        b.append((x, y))
    d = {}
    e = 0
    for i in tree:
        if len(tree[i]) >= 3:
            for j in tree[i]:
                if (j, i) in c:
                    d[(j, i)] = e
                else:
                    d[(i, j)] = e
                e += 1
                if e == 3:
                    break
            break
    for i in b:
        if d.get(i) != None:
            print(d[i])
        else:
            print(e)
            e += 1
            
# region fastio
BUFSIZE = 8192

class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)
input = lambda: sys.stdin.readline().rstrip("\r\n")

if __name__ == "__main__":
    main()