def f(c):
    if c == "A":
        return 0
    elif c == "B":
        return 1
    else:
        return c

N, K, T = map(int, input().split())
C = [None] + list(input()) + [None]
C = list(map(f, C))
D = ["Alice", "Bob"]
left, right = 0, 0
for i in range(K - 1, -1, -1):
    if C[K] == C[i]:
        left += 1
for i in range(K, N + 1):
    if C[K] == C[i]:
        right += 1
if left % 2 and T > left:
    print(D[C[K]])
elif right % 2 and T > right:
    print(D[C[K]])
elif T <= left and T <= right:
    print(D[1 - C[K]])
else:
    print(D[C[K]]) if T % 2 else print(D[1 - C[K]])
    
# if C[K - 1] != C[K] and C[K + 1] != C[K]:
#     print(D[C[K]]) if T % 2 else print(D[1 - C[K]])