import sys
input = sys.stdin.readline

N, K, T = map(int, input().split())
c = list(input().rstrip())
K -= 1

flip = False
if c[K] == 'B':
    flip = True
    c = ['B' if x == 'A' else 'A' for x in c]


def answer(ans):
    if ans == 0:
        print("Alice" if not flip else "Bob")
    else:
        print("Bob" if not flip else "Alice")


dist = []
for i in range(K+1, N):
    if i-K > T:
        break
    if c[i] == 'B':
        dist.append(i - K)
        break
for i in range(K)[::-1]:
    if K-i > T:
        break
    if c[i] == 'B':
        dist.append(K - i)
        break

if not dist:
    answer(1)
    exit()

if max(dist) > 1:
    if any(T % 2 == d % 2 for d in dist):
        answer(0)
    else:
        answer(1)
else:
    if T % 2 == 0:
        answer(1)
    else:
        if T == 1:
            answer(0)
        else:
            # check right
            i = K+1
            while i < N and c[i] == 'B':
                i += 1
            right = i-(K+1) <= T-1 and (i-(K+1)) % 2 == 0

            i = K-1
            while i >= 0 and c[i] == 'B':
                i -= 1
            left = (K-1)-i <= T-1 and ((K-1)-i) % 2 == 0

            answer(1 if left and right else 0)