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

class UnionFind(object):
    def __init__(self, n=1):
        self.par = [i for i in range(n)]
        self.rank = [0 for _ in range(n)]
        self.size = [1 for _ in range(n)]

    def find(self, x):
        if self.par[x] == x:
            return x
        else:
            self.par[x] = self.find(self.par[x])
            return self.par[x]

    def union(self, x, y):
        x = self.find(x)
        y = self.find(y)
        if x != y:
            if self.rank[x] < self.rank[y]:
                x, y = y, x
            if self.rank[x] == self.rank[y]:
                self.rank[x] += 1
            self.par[y] = x
            self.size[x] += self.size[y]

    def is_same(self, x, y):
        return self.find(x) == self.find(y)

    def get_size(self, x):
        x = self.find(x)
        return self.size[x]


N = int(input())
A, B = [0] * N, [0] * N
G = [[] for i in range(N)]
U = UnionFind(N)
for i in range(N):
    A[i], B[i] = map(int, input().split())
    A[i], B[i] = A[i] - 1, B[i] - 1
    G[A[i]].append((B[i], i))
    G[B[i]].append((A[i], i))
    U.union(A[i], B[i])
    
Q = [deque() for _ in range(N)]
cnt = [0] * N
ans, seen = [-1] * N, [0] * N
for i in range(N):
    ui = U.find(A[i])
    cnt[ui] += 1
    if cnt[ui] == U.get_size(ui):
        Q[ui].append(A[i])
        ans[i] = A[i] + 1
        seen[A[i]] = 1
    elif cnt[ui] > U.get_size(i):
        print("No")
        exit()
        
for s in range(N):
    while Q[s]:
        u = Q[s].popleft()
        for v, ind in G[u]:
            if seen[v]:
                continue
            ans[ind] = v + 1
            Q[s].append(v)
            seen[v] = 1
            
print("Yes")
for a in ans:
    print(a)