#include <bits/stdc++.h>
typedef long long LL;
typedef unsigned long long ULL;
typedef std::pair<int, int> pii;
#define fi first
#define se second
#define MP std::make_pair
int read()
{
	int s = 0, f = 1;
	char c = getchar();
	while (!(c >= '0' && c <= '9'))
		f ^= (c == '-'), c = getchar();
	while (c >= '0' && c <= '9')
		s = s * 10 + (c - '0'), c = getchar();
	return f ? s : -s; 
}
ULL readull()
{
	ULL s = 0;
	char c = getchar();
	while (!(c >= '0' && c <= '9')) c = getchar();
	while (c >= '0' && c <= '9')
		s = s * 10 + (c - '0'), c = getchar();
	return s; 
}
template<typename T>
void write(T x, char end = '\n')
{
	if (x == 0) return putchar('0'), putchar(end), void();
	if (x < 0) putchar('-'), x = -x;
	static int d[100], cur;
	for (cur = 0; x; x /= 10) d[++cur] = x % 10;
	for (int i = cur; i; i--) putchar('0' + d[i]);
	putchar(end);
}
const int MAXN = 1005;
int n, m, sg[MAXN][MAXN];
int lsg[MAXN], rsg[MAXN];
int lt[4][MAXN], rt[4][MAXN], lf[4][MAXN], rf[4][MAXN];
char s[MAXN][MAXN];
auto nxt = [](int x){ return x == m ? 1 : x + 1; };
auto pre = [](int x){ return x == 1 ? m : x - 1; };
int mex(int x){ return x == 0; }
int mex(int x, int y)
{	
	int res = 0;
	for (; ; res++)
	{
		if (x == res || y == res)
		{ res++; continue; }
		break;
	}
	return res;
}
int mex(int x, int y, int z)
{
	int res = 0;
	for (; ; res++)
	{
		if (x == res || y == res || z == res)
		{ res++; continue; }
		break;
	}
	return res;
}
int main()
{
	n = read(), m = read();
	for (int i = 1; i <= n; i++)
		scanf("%s", s[i] + 1);
	memset(sg, -1, sizeof sg);
	for (int i = n; i; i--)
	{
		int pos = 0;
		for (int j = 1; j <= m; j++)
			if (s[i][j] == '#') { pos = j; break; }
		if (m == 1) sg[i][1] = pos ? -1 : mex(sg[i + 1][1]);
		else if (pos)
		{
			memset(lsg, -1, sizeof lsg);
			memset(rsg, -1, sizeof rsg);
			for (int j = nxt(pos); j != pos; j = nxt(j))
			{
				if (s[i][j] == '#') continue;
				lsg[j] = mex(lsg[pre(j)], sg[i + 1][j]);
			}
			for (int j = pre(pos); j != pos; j = pre(j))
			{
				if (s[i][j] == '#') continue;
				rsg[j] = mex(rsg[nxt(j)], sg[i + 1][j]);
			}
			for (int j = 1; j <= m; j++)
				if (s[i][j] != '#') sg[i][j] = mex(lsg[pre(j)], rsg[nxt(j)], sg[i + 1][j]);
		}
		else
		{
			for (int o = 0; o <= 3; o++)
			{
				lt[o][1] = o;
				for (int j = 2; j <= m; j++)
					lt[o][j] = mex(lt[o][j - 1], sg[i + 1][j]);
				rt[o][m] = o;
				for (int j = m - 1; j; j--)
					rt[o][j] = mex(rt[o][j + 1], sg[i + 1][j]);
			}
			for (int j = 1; j <= m; j++)
				for (int o = 0; o <= 3; o++)
					if (j == 1) rf[o][j] = o;
					else rf[o][j] = rf[mex(o, sg[i + 1][j - 1])][j - 1];
			for (int j = m; j; j--)
				for (int o = 0; o <= 3; o++)
					if (j == m) lf[o][j] = o;
					else lf[o][j] = lf[mex(o, sg[i + 1][j + 1])][j + 1];
			sg[i][1] = mex(sg[i + 1][1], lf[mex(sg[i + 1][2])][2], rt[mex(sg[i + 1][m])][2]);
			sg[i][m] = mex(sg[i + 1][m], lt[mex(sg[i + 1][1])][m - 1], rf[mex(sg[i + 1][m - 1])][m - 1]);
			for (int j = 2; j < m; j++)
			{
				int L = lt[mex(sg[i + 1][1], lf[mex(sg[i + 1][j + 1])][j + 1])][j - 1];
				int R = rt[mex(sg[i + 1][m + 1], rf[mex(sg[i + 1][j - 1])][j - 1])][j + 1];
				sg[i][j] = mex(sg[i + 1][j], L, R);
			}
		}
	}
	int ans = 0;
	for (int i = 1; i <= n; i++)
		for (int j = 1; j <= m; j++)
			if (s[i][j] == 'B') ans ^= sg[i][j];
	printf(ans ? "Alice\n" : "Bob\n");
	return 0;
}