import sys

# sys.setrecursionlimit(200005)
int1 = lambda x: int(x)-1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def SI(): return sys.stdin.readline().rstrip()
dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
inf = 10**16
# md = 998244353
md = 10**9+7

from collections import *

# __dfsのflow_to_meの初期値がinfに相当するか注意
# n頂点,sスタート,tゴール
class Dinic:
    def __init__(self, n, s, t):
        self.n, self.s, self.t = n, s, t
        self.to = [[] for _ in range(n)]
        self.max_flow = -1

    def add_edge(self, u, v, cap):
        u_index_in_to_v = len(self.to[v])
        v_index_in_to_u = len(self.to[u])
        self.to[u].append([v, cap, u_index_in_to_v])
        self.to[v].append([u, 0, v_index_in_to_u])

    # 無向辺の追加
    def add_undir_edge(self, u, v, cap):
        u_index_in_to_v = len(self.to[v])
        v_index_in_to_u = len(self.to[u])
        self.to[u].append([v, cap, u_index_in_to_v])
        self.to[v].append([u, cap, v_index_in_to_u])

    def __set_level(self):
        s = self.s
        level = [-1] * self.n
        level[s] = 0
        q = deque()
        q.append([s, 0])
        while q:
            u, u_level = q.popleft()
            for v, cap, _ in self.to[u]:
                if cap == 0: continue
                if level[v] != -1: continue
                level[v] = u_level + 1
                if v == self.t:
                    self.level = level
                    return True
                q.append([v, u_level + 1])
        return False

    def __dfs(self, u=-1, flow_to_me=10 ** 16):
        if u == -1: u = self.s
        if u == self.t: return flow_to_me
        flow_from_me = 0
        u_level = self.level[u]
        for utov_i, (v, cap, vtou_i) in enumerate(self.to[u]):
            if self.level[v] != u_level + 1: continue
            if cap == 0: continue
            flow_to_v = self.__dfs(v, min(cap, flow_to_me - flow_from_me))
            if not flow_to_v: continue
            flow_from_me += flow_to_v
            self.to[u][utov_i][1] -= flow_to_v
            self.to[v][vtou_i][1] += flow_to_v
        return flow_from_me

    def __calculation(self):
        res = 0
        while self.__set_level():
            res += self.__dfs()
        return res

    # これが出力用
    def get_max_flow(self):
        if self.max_flow == -1:
            self.max_flow = self.__calculation()
        return self.max_flow

n = II()
mf = Dinic(2*n+2,2*n,2*n+1)
for i in range(n):
    a, b = LI1()
    mf.add_edge(2*n, i, 1)
    mf.add_edge(i, a+n, 1)
    mf.add_edge(i, b+n, 1)
    mf.add_edge(i+n, 2*n+1, 1)

mx = mf.get_max_flow()
ans = [0]*n
if mx == n:
    print("Yes")
    for u in range(n):
        for v,c,_ in mf.to[u]:
            if v<2*n and c==0:
                ans[u]=v-n+1
    #     if e.src < n and e.flow:
    #         ans[e.src] = e.dst-n+1
    print(*ans, sep="\n")
else:
    print("No")