import sys

if __name__ == "__main__":
    line0ne = sys.stdin.readline().strip()
    n = int(line0ne)
    line = sys.stdin.readline().strip()
    values = map(int, line.split())
    count = 0
    a = values[n-1]
    if(a == 0):
        print 'Bob'
    else:
        print 'Alice'