//        No mind to think.
//
//        No will to break.
//
//        No voice to cry suffering.
//
//        Born of God and Void.
//
//        You shall seal the blinding light that plagues their dreams.
//
//        You are the Vessel.
//
//        You are the Hollow Knight.
#ifdef N2
#define _GLIBCXX_DEBUG
#define LOG(...) fprintf(stderr, __VA_ARGS__)
#define DO(...) __VA_ARGS__
#define NDO(...) 
#else 
#define LOG(...)
#define DO(...)
#define NDO(...) __VA_ARGS__
#endif
#define syncoff ios::sync_with_stdio(0), cin.tie(0), cout.tie(0)
#include<bits/stdc++.h>
using namespace std;
const int maxn = 1010;
int h, w;
int Mex(int x = -1, int y = -1, int z = -1) {
    if(x != 0 && y != 0 && z != 0) return 0;
    if(x != 1 && y != 1 && z != 1) return 1;
    if(x != 2 && y != 2 && z != 2) return 2;
    return 3;
}
int L[maxn], R[maxn], Lt[maxn][4], Rt[maxn][4], Lf[maxn][4], Rf[maxn][4];
int f[maxn][maxn];
bool emp[maxn][maxn];
int CalcL(int i, int j) {
    if(!emp[i][j]) return -1;
    if(~L[j]) return L[j];
    int pre = j - 1 ? j - 1 : w;
    return L[j] = Mex(f[i + 1][j], emp[i][pre] ? CalcL(i, pre) : -1);
}
int CalcR(int i, int j) {
    if(!emp[i][j]) return -1;
    if(~R[j]) return R[j];
    int nxt = j % w + 1;
    return R[j] = Mex(f[i + 1][j], emp[i][nxt] ? CalcR(i, nxt) : -1);
}
vector<pair<int, int>> bean;
int main() {
    cin >> h >> w;
    for(int i = 1; i <= h; i++) {
        string in;
        cin >> in;
        for(int j = 1; j <= w; j++) {
            switch(in[j - 1]) {
            case '.':
                emp[i][j] = true;
                break;
            case '#':
                emp[i][j] = false;
                break;
            case 'B':
                emp[i][j] = true;
                bean.emplace_back(i, j);
                break;
            }
        }
    }
    memset(f[h + 1], -1, sizeof(f[h + 1]));
    for(int i = h; i; i--) {
        memset(f[i], -1, sizeof(f[i]));
        if(w == 1) {if(emp[i][1]) f[i][1] = Mex(f[i + 1][1]); continue;}
        bool nod = true;
        for(int j = 1; j <= w; j++) {
            if(!emp[i][j]) {
                nod = false;
                break;
            }
        }
        if(!nod) {
            memset(L, -1, sizeof(L));
            memset(R, -1, sizeof(R));
            for(int j = 1; j <= w; j++) {
                int pre = j - 1 ? j - 1 : w;
                int nxt = j % w + 1;
                if(emp[i][j]) f[i][j] = Mex(f[i + 1][j], CalcL(i, pre), CalcR(i, nxt));
            }
            continue;
        }
        for(int j = 1; j <= w; j++) for(int k = 0; k <= 3; k++) Lt[j][k] = (j == 1) ? k : Mex(Lt[j - 1][k], f[i + 1][j]);
        for(int j = w; j; j--) for(int k = 0; k <= 3; k++) Rt[j][k] = (j == w) ? k : Mex(Rt[j + 1][k], f[i + 1][j]);
        for(int j = w; j; j--) for(int k = 0; k <= 3; k++) Lf[j][k] = (j == w) ? k : Lf[j + 1][Mex(k, f[i + 1][j + 1])];
        for(int j = 1; j <= w; j++) for(int k = 0; k <= 3; k++) Rf[j][k] = (j == 1) ? k : Rf[j - 1][Mex(k, f[i + 1][j - 1])];
        f[i][1] = Mex(Lf[2][Mex(f[i + 1][2])], Rt[2][Mex(f[i + 1][w])], f[i + 1][1]);
        f[i][w] = Mex(Rf[w - 1][Mex(f[i + 1][w - 1])], Lt[w - 1][Mex(f[i + 1][1])], f[i + 1][w]);
        for(int j = 2; j < w; j++) 
            f[i][j] = Mex(f[i + 1][j], Lt[j - 1][Mex(f[i + 1][1], Lf[j + 1][Mex(f[i + 1][j + 1])])], Rt[j + 1][Mex(f[i + 1][w], Rf[j - 1][Mex(f[i + 1][j - 1])])]);
    }
    int ans = 0;
    for(auto b : bean) {
        ans ^= f[b.first][b.second];
    }
    // for(int i = 1; i <= h; i++) LOG("%d: %d\n", i, f[i][1]);
    // LOG("%d\n", ans);
    if(ans) cout << "Alice\n";
    else cout << "Bob\n";
}