from collections import deque

n = int(input())

g = [[] for _ in range(n)]
deg = [0 for _ in range(n)]
used = [False for _ in range(n)]
ans = [None for _ in range(n)]
for e in range(n):
  a, b = map(int, input().split())
  a -= 1
  b -= 1
  if a == b:
    used[a] = True
    ans[e] = a + 1
  else:
    g[a].append((b, e))
    g[b].append((a, e))
    deg[a] += 1
    deg[b] += 1

dq = deque()
for u in range(n):
  if used[u]:
    continue
  if len(g[u]) == 0:
    print("No")
    exit()
  elif len(g[u]) == 1:
    used[u] = True
    dq.append(u)

while len(dq) > 0:
  cur = dq.popleft()
  for nxt, e in g[cur]:
    if not ans[e] is None:
      continue
    deg[nxt] -= 1
    ans[e] = cur + 1
    if deg[nxt] == 0:
      print("No")
      exit()
    elif deg[nxt] == 1:
      used[nxt] = True
      dq.append(nxt)

for src in range(n):
  if used[src]:
    continue
  dq.append(src)
  while len(dq) > 0:
    cur = dq.popleft()
    while len(g[cur]) > 0:
      nxt, e = g[cur].pop()
      if not ans[e] is None:
        continue
      ans[e] = cur + 1
      if used[nxt]:
        continue
      used[nxt] = True
      dq.append(nxt)
      break

if ans.count(None) > 0:
  print("No")
else:
  print("Yes")
  print(*ans, sep="\n")