import sys, math

def input():
    return sys.stdin.readline()[:-1]

def main():
    N = int(input())
    G = [0 for k in range(N)]
    for k in range(N-1):
        u, v = map(int,input().split())
        G[u-1] += 1
        G[v-1] += 1
    t = 0
    o = 0
    z = 0
    for e in G:
        if e == 2:
            t += 1
        elif e == 1:
            o += 1
        elif e == 0:
            z += 1
    if t == N-2 and o == 2:
        print("Bob")
    elif t == N-1 and z == 1:
        print("Bob")
    else:
        print("Alice")
if __name__ == '__main__':
    main()