import sys
input = sys.stdin.readline
from collections import *

class Unionfind:
    def __init__(self, n):
        self.par = [-1]*n
        self.rank = [1]*n
    
    def root(self, x):
        r = x
        
        while not self.par[r]<0:
            r = self.par[r]
        
        t = x
        
        while t!=r:
            tmp = t
            t = self.par[t]
            self.par[tmp] = r
        
        return r
    
    def unite(self, x, y):
        rx = self.root(x)
        ry = self.root(y)
        
        if rx==ry:
            return
        
        if self.rank[rx]<=self.rank[ry]:
            self.par[ry] += self.par[rx]
            self.par[rx] = ry
            
            if self.rank[rx]==self.rank[ry]:
                self.rank[ry] += 1
        else:
            self.par[rx] += self.par[ry]
            self.par[ry] = rx
    
    def is_same(self, x, y):
        return self.root(x)==self.root(y)
    
    def count(self, x):
        return -self.par[self.root(x)]

def bfs(s):
    dist[s] = 0
    q = deque([s])
    
    while q:
        v = q.popleft()
        
        for nv in G[v]:
            if dist[nv]==-1:
                dist[nv] = dist[v]+1
                q.append(nv)
    
    return dist
    
N = int(input())
AB = []
uf = Unionfind(N)
ex_edges = set()
G = [[] for _ in range(N)]

for _ in range(N):
    A, B = map(int, input().split())
    AB.append((A-1, B-1))
    
    if uf.is_same(A-1, B-1):
        ex_edges.add((A-1, B-1))
    else:
        uf.unite(A-1, B-1)
        G[A-1].append(B-1)
        G[B-1].append(A-1)
    
ex_cnt = defaultdict(int)

for A, _ in ex_edges:
    ex_cnt[uf.root(A)] += 1

rs = set(uf.root(i) for i in range(N))

for r in rs:
    if ex_cnt[r]==0:
        exit(print('No'))
        
dist = [-1]*N

for A, _ in ex_edges:
    bfs(A)

print('Yes')

for A, B in AB:
    if (A, B) in ex_edges:
        print(A+1)
    else:
        if dist[A]>dist[B]:
            print(A+1)
        else:
            print(B+1)