import sys
input = sys.stdin.readline

N = int(input())
G = [set() for _ in range(N)]
deg = [0] * N
for i in range(N):
    A, B = map(lambda x: int(x) - 1, input().split())
    G[A].add((B, i))
    G[B].add((A, i))
    deg[A] += 1
    deg[B] += 1
if 0 in deg:
    print("No")
    exit()
st = []
for v in range(N):
    if deg[v] == 1:
        st.append(v)
ans = [0] * N
while st:
    v = st.pop()
    if deg[v] == 0:
        print("No")
        exit()
    u, i = next(iter(G[v]))
    deg[v] -= 1
    deg[u] -= 1
    G[v].remove((u, i))
    if u != v:
        G[u].remove((v, i))
    ans[i] = v
    if deg[u] == 1:
        st.append(u)
for s in range(N):
    if deg[s] == 0:
        continue
    st.append(s)
    while st:
        v = st.pop()
        u, i = next(iter(G[v]))
        deg[v] -= 1
        deg[u] -= 1
        G[v].remove((u, i))
        if u != v:
            G[u].remove((v, i))
        ans[i] = v
        if deg[u] == 1:
            st.append(u)
print("Yes")
print(*map(lambda x: x + 1, ans), sep='\n')