#include<bits/stdc++.h>
using namespace std;
namespace my_IO{
    #define ll long long
    #define ull unsigned long long
    #define ld long double
    #define spc putchar(' ')
    #define et putchar('\n')
    template<class T>
    void read(T &num){
        T x=0,f=1;
        char c=getchar();
        while(!isdigit(c)){
            if(c=='-') f=-1;
            c=getchar();
        }
        while(isdigit(c)){
            x=(x<<3)+(x<<1)+c-48;
            c=getchar();
        }
        num=f*x;
    }
    template<class T>
    void write(T x){
        static char buf[40];
        static int len=-1;
        if(x<0) putchar('-'),x=-x;
        do{
            buf[++len]=x%10+48;
            x/=10;
        }while(x);
        while(len>=0) putchar(buf[len--]);
    }
}
using namespace my_IO;
const ll maxn=1010;
ll n,m,a[maxn][maxn],f[maxn][maxn],L[maxn],R[maxn],lf[maxn][4],rf[maxn][4],lt[maxn][4],rt[maxn][4];
ll mex(ll a){
    if(a!=0) return 0;
    return 1;
}
ll mex(ll a,ll b){
    if(a!=0&&b!=0) return 0;
    if(a==1||b==1) return 2;
    return 1;
}
ll mex(ll a,ll b,ll c){
    if(a!=0&&b!=0&&c!=0) return 0;
    if(a!=1&&b!=1&&c!=1) return 1;
    if(a!=2&&b!=2&&c!=2) return 2;
    return 3;
}
void solve(){
    read(n),read(m);
    for(ll i=1;i<=n;i++){
        for(ll j=1;j<=m;j++){
            char c;
            cin>>c;
            if(c=='#') a[i][j]=1;
            if(c=='B') a[i][j]=2;
        }
    }
    memset(f,-1,sizeof(f));
    for(ll i=n;i>=1;i--){
        // cout<<i<<":\n";
        memset(L,-1,sizeof(L));
        memset(R,-1,sizeof(R));
        memset(lf,-1,sizeof(lf));
        memset(rf,-1,sizeof(rf));
        memset(lt,-1,sizeof(lt));
        memset(rt,-1,sizeof(rt));
        ll flag=0;
        for(ll j=1;j<=m;j++) if(a[i][j]==1) flag=1;
        if(flag){
            ll pos=0;
            for(ll j=1;j<=m;j++) if(a[i][j]==1) pos=j;
            for(ll j=pos%m+1;j!=pos;j=j%m+1){
                if(a[i][j]==1) continue;
                L[j]=mex(L[(j-2+m)%m+1],f[i+1][j]);
                // cout<<j<<" "<<L[j]<<"\n";
            }
            // et;
            for(ll j=(pos-2+m)%m+1;j!=pos;j=(j-2+m)%m+1){
                if(a[i][j]==1) continue;
                R[j]=mex(R[j%m+1],f[i+1][j]);
                // cout<<j<<" "<<R[j]<<"\n";
            }
            for(ll j=1;j<=m;j++) if(a[i][j]!=1) f[i][j]=mex(f[i+1][j],L[(j-2+m)%m+1],R[j%m+1]);
            continue;
        }
        for(ll j=0;j<=3;j++) lt[1][j]=rt[m][j]=lf[m][j]=rf[1][j]=j;
        for(ll j=2;j<=m;j++) for(ll k=0;k<=3;k++) lt[j][k]=mex(lt[j-1][k],f[i+1][j]);
        for(ll j=m-1;j;j--) for(ll k=0;k<=3;k++) rt[j][k]=mex(rt[j+1][k],f[i+1][j]);
        for(ll j=m-1;j;j--) for(ll k=0;k<=3;k++) lf[j][k]=lf[j+1][mex(f[i+1][j+1],k)];
        for(ll j=2;j<=m;j++) for(ll k=0;k<=3;k++) rf[j][k]=rf[j-1][mex(f[i+1][j-1],k)];
        f[i][1]=mex(lf[2][mex(f[i+1][2])],rt[2][mex(f[i+1][m])],f[i+1][1]);
        f[i][m]=mex(lt[m-1][mex(f[i+1][1])],rf[m-1][mex(f[i+1][m-1])],f[i+1][m]);
        for(ll j=2;j<m;j++){
            L[j-1]=lt[j-1][mex(lf[j+1][mex(f[i+1][j+1])],f[i+1][1])];
            R[j+1]=rt[j+1][mex(rf[j-1][mex(f[i+1][j-1])],f[i+1][m])];
            f[i][j]=mex(L[j-1],R[j+1],f[i+1][j]);
        }
    }
    ll res=0;
    for(ll i=1;i<=n;i++) for(ll j=1;j<=m;j++) if(a[i][j]==2) res^=f[i][j];
    if(res) puts("Alice");
    else puts("Bob");
}
int main(){
    int t=1;
    while(t--) solve();
}