#include<bits/stdc++.h>
using namespace std;
#define i64 __int128
#define ll long long
#define pb push_back
#define fi first
#define se second
#define pii pair<int,int>
#define lowbit(i) i&(-i)
const int N = 1005;
int h,w;
char s[N][N];
int f[N][N],L[N],R[N];
int vis[5],Lt[N][5],Rt[N][5],Lf[N][5],Rf[N][5];
int pre[N],nxt[N];
int mex(int a){
    if(a) return 0;
    return 1;
}
int mex2(int a,int b){
    vis[a] = vis[b] = 1;
    int res = 0;
    while(vis[res]) res++;
    vis[a] = vis[b] = 0;
    return res;
}
int mex3(int a,int b,int c){
    vis[a] = vis[b] = vis[c] = 1;
    int res = 0;
    while(vis[res]) res++;
    vis[a] = vis[b] = vis[c] = 0;
    return res;
}
int main(){
    cin.tie(0),cout.tie(0);
    ios::sync_with_stdio(0);
    cin >> h >> w;
    for(int i=1;i<=h;i++){
        for(int j=1;j<=w;j++){
            cin >> s[i][j];
        }
    }
    for(int j=1;j<=w;j++) f[h+1][j] = 3;
    for(int i=1;i<=w;i++) pre[i] = i-1,nxt[i] = i+1;
    pre[1] = w,nxt[w] = 1;
    for(int i=h;i>=1;i--){
        int typ = 0;
        for(int j=1;j<=w;j++) if(s[i][j]=='#') typ = 1;
        if(typ){
            for(int j=1;j<=w;j++){
                if(s[i][j]=='#'){
                    L[j] = R[j] = 3;
                    int k = pre[j];
                    while(s[i][k]!='#') R[k] = mex2(R[nxt[k]],f[i+1][k]),k = pre[k];
                    k = nxt[j];
                    while(s[i][k]!='#') L[k] = mex2(L[pre[k]],f[i+1][k]),k = nxt[k];
                }
            }
            for(int j=1;j<=w;j++){
                if(s[i][j]=='#') f[i][j] = 3;
                else f[i][j] = mex3(L[pre[j]],R[nxt[j]],f[i+1][j]);
            }
        }else{
            if(w==1){
                f[i][1] = mex(f[i+1][1]);
                continue;
            }
            for(int k=0;k<=3;k++){
                Lt[1][k] = k;
                for(int j=2;j<=w;j++) Lt[j][k] = mex2(Lt[j-1][k],f[i+1][j]);                
            } 
            for(int k=0;k<=3;k++){
                Rt[w][k] = k;
                for(int j=w-1;j>=1;j--) Rt[j][k] = mex2(Rt[j+1][k],f[i+1][j]);
            }
            for(int k=0;k<=3;k++) Lf[w][k] = k;
            for(int j=1;j<w;j++){
                for(int k=0;k<=3;k++){
                    Lf[j][mex2(k,f[i+1][j])] = Lf[pre[j]][k];
                }
            }   
            for(int k=0;k<=3;k++) Rf[1][k] = k;
            for(int j=w;j>1;j--){
                for(int k=0;k<=3;k++){
                    Rf[j][mex2(k,f[i+1][j])] = Rf[nxt[j]][k];
                }
            }
            f[i][1] = mex3(Lf[2][mex(f[i+1][2])],Rt[2][mex(f[i+1][w])],f[i+1][1]);
            f[i][w] = mex3(Lt[w-1][mex(f[i+1][1])],Rf[w-1][mex(f[i+1][w-1])],f[i+1][w]);
            for(int j=2;j<w;j++){
                f[i][j] = mex3(Lt[j-1][mex2(Lf[j+1][mex(f[i+1][j+1])],f[i+1][1])],Rt[j-1][mex2(Rf[j-1][mex(f[i+1][j-1])],f[i+1][w])],f[i+1][j]);
            }
        }
    }
    int ans = 0;
    for(int i=1;i<=h;i++){
        for(int j=1;j<=w;j++){
            if(s[i][j]=='B') ans ^= f[i][j];
        }
    }
    if(ans) cout << "Alice";
    else cout << "Bob";
    return 0;
}