#include <bits/stdc++.h>
#pragma GCC target("sse,sse2,sse3,sse3,sse4,popcnt,abm,mmx,avx,avx2")
// #define ATC
#define LL long long
#define eb emplace_back
#define FIO(FILENAME) freopen(FILENAME".in", "r", stdin), freopen(FILENAME".out", "w", stdout)
using namespace std;

#ifdef ATC
#include <atcoder/all>
using namespace atcoder;
#endif

constexpr int N = 1007;
int n, m, L[N][N], R[N][N], f[N][N];
string s[N];

inline int mex (vector<int> v) {
	bitset<7> s;
	for (int x : v) s.set(x);
	int r = 0;
	while (s[r]) ++r;
	return r;
}

inline int gtn (int i) {
	int r = i + 1;
	return r >= m ? 0 : r;
}

inline int gtp (int i) {
	int r = i - 1;
	return r < 0 ? m - 1 : r;
}

namespace BF1 {
	void main (int o) {
		int p = s[o].find('#');
		int i = p;
		do {
			int r = gtn(i);
			while (s[o][r] != '#' && r != p) r = gtn(r);
			for (int j = gtn(i); j != r; j = gtn(j)) L[o][j] = mex({L[o][gtp(j)], f[o + 1][j]});
			for (int j = gtp(r); j != i; j = gtp(j)) R[o][j] = mex({R[o][gtn(j)], f[o + 1][j]});
			i = r;
		} while (i != p);
		for (int j = 0; j < m; j++) {
			if (s[o][j] != '#') {
				f[o][j] = mex({L[o][gtp(j)], R[o][gtn(j)], f[o + 1][j]});
			}
		}
	}
}

namespace BF2 {
	struct Node {
		int g[4];
		Node (int o = 0) { iota(g, g + 4, 0); }
		Node operator * (const Node &rhs) const {
			Node r;
			for (int i = 0; i < 4; i++) r.g[i] = rhs.g[g[i]];
			return r;
		}
	} a[N], pr[N], sf[N];
	void main (int o) {
		if (m == 1) {
			f[o][0] = mex({f[o + 1][0]});
			return;
		}
		for (int i = 0; i < m; i++) {
			for (int j = 0; j < 3; j++) {
				a[i].g[j] = mex({f[o + 1][i], j});
			}
		}
		pr[0] = a[0];
		for (int i = 1; i < m; i++) pr[i] = pr[i - 1] * a[i];
		sf[m - 1] = a[m - 1];
		for (int i = m - 2; ~i; i--) sf[i] = a[i] * sf[i + 1];
		for (int i = 0; i < m; i++) {
			Node r;
			if (i < m - 1) r = r * sf[i + 1];
			if (i > 1) r = r * pr[i - 2];
			L[o][gtp(i)] = r.g[mex({f[o + 1][i]})];
		}
		pr[0] = a[0];
		for (int i = 1; i < m; i++) pr[i] = a[i] * pr[i - 1];
		sf[m - 1] = a[m - 1];
		for (int i = m - 2; ~i; i--) sf[i] = sf[i + 1] * a[i];
		for (int i = 0; i < m; i++) {
			Node r;
			if (i > 0) r = r * pr[i - 1];
			if (i < m - 2) r = r * sf[i + 2];
			R[o][gtn(i)] = r.g[mex({f[o + 1][i]})];
		}
		for (int j = 0; j < m; j++) {
			f[o][j] = mex({f[o + 1][j], L[o][j], R[o][j]});
		}
	}
}

int main() {
	ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
	cin >> n >> m;
	for (int i = 0; i < n; i++) cin >> s[i];
	for (int i = 0; i < m; i++) f[n][i] = L[n][i] = R[n][i] = 6;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			if (s[i][j] == '#') {
				f[i][j] = L[i][j] = R[i][j] = 6;
			}
		}
	}
	for (int i = n - 1; ~i; i--) {
		if (s[i].find('#') == s[i].npos) {
			BF2::main(i);
		} else {
			BF1::main(i);
		}
	}
	// for (int i = 0; i < n; i++) {
	// 	for (int j = 0; j < m; j++) {
	// 		cout << f[i][j] << " \n"[j == m - 1];
	// 	}
	// }
	unsigned r = 0;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			if (s[i][j] == 'B') {
				r ^= f[i][j];
			}
		}
	}
	puts(r ? "Alice" : "Bob");
}
// I love WHQ!