N = int(input())

V = [[] for i in range(N)]
y = [0] * N

for _ in range(N - 1):
    u, v = map(int, input().split())
    y[u] += 1
    y[v] += 1
    
    V[u] += [v]
    V[v] += [u]
    
visited = [0] * N
count = 0
for i in range(N):
    if visited[i] == 0:
        visited[i] = 1
        que = [i]
        x = 0
        while que:
            q = que.pop()
            for v in V[q]:
                if visited[v] == 0:
                    que += [v]
                    visited[v] = 1
            x += 1
        if x == N:
            print('Bob')
            exit()
        elif x == N - 1 and y.count(2) == N - 1:
            print('Bob')
            exit()
print('Alice')