N = int(input())
boxes = list(map(int,input().split()))

choiceA = 0
choiceB = 0

for candy in boxes:
    if candy == 0:
        choiceB += 1
    elif candy % 2 == 1:
        choiceB += 1
    elif candy % 2 == 0:
        choiceA += 1

if choiceA > choiceB and N % 2 == 0:
    print("A")
elif choiceA > choiceB and N % 2 == 1:
    print("B")
elif choiceB >= choiceA and N % 2 == 1:
    print("B")
else:
    print("A")