N, K, T = map(int, input().split())
C = input()

K -= 1
S = C[K]

n = 0 if S == "A" else "B"

l, r = 0, 0
fl, fr = False, False
idx = K-1
while 0 <= idx and C[idx] == S:
    l += 1
    idx -= 1
if idx == -1: fl = True
idx = K+1
while idx < N and C[idx] == S:
    r += 1
    idx += 1
if idx == N: fr = True

ans = ["Alice", "Bob"]

if 1 <= l+r:
    if l%2 != T%2 and l < T and not fl or r%2 != T%2 and r < T and not fr:
        print(ans[n])
    else:
        print(ans[n^1])
else:
    if T%2 == 1:
        print(ans[n])
    else:
        print(ans[n^1])