#include<bits/stdc++.h>
using namespace std;
namespace my_std{
	#define ll long long
	#define bl bool
	ll my_pow(ll a,ll b,ll mod){
		ll res=1;
		if(!b) return 1;
		while(b){
			if(b&1) res=(res*a)%mod;
			a=(a*a)%mod;
			b>>=1;
		}
		return res;
	}
	ll qpow(ll a,ll b){
		ll res=1;
		if(!b) return 1;
		while(b){
			if(b&1) res*=a;
			a*=a;
			b>>=1;
		}
		return res;
	}
	#define db double
	#define pf printf
	#define pc putchar
	#define fr(i,x,y) for(register ll i=(x);i<=(y);i++)
	#define pfr(i,x,y) for(register ll i=(x);i>=(y);i--)
	#define go(u) for(ll i=head[u];i;i=e[i].nxt)
	#define enter pc('\n')
	#define space pc(' ')
	#define fir first
	#define sec second
	#define MP make_pair
	#define il inline
	#define inf 8e18
	#define random(x) rand()*rand()%(x)
	#define inv(a,mod) my_pow((a),(mod-2),(mod))
	il ll read(){
		ll sum=0,f=1;
		char ch=0;
		while(!isdigit(ch)){
			if(ch=='-') f=-1;
			ch=getchar();
		}
		while(isdigit(ch)){
			sum=sum*10+(ch^48);
			ch=getchar();
		}
		return sum*f;
	}
	il void write(ll x){
		if(x<0){
			x=-x;
			pc('-');
		}
		if(x>9) write(x/10);
		pc(x%10+'0');
	}
	il void writeln(ll x){
		write(x);
		enter;
	}
	il void writesp(ll x){
		write(x);
		space;
	}
}
using namespace my_std;
#define L(x) (((x)+m-2)%m+1)
#define R(x) ((x)%m+1)
ll n,m,f[1010][1010],l[1010],r[1010],lto[1010][4],rto[1010][4],lft[1010][4],rgt[1010][4];
char s[1010][1010];
il ll calc(ll a1=-1,ll a2=-1,ll a3=-1){
	fr(i,0,3) if(i!=a1&&i!=a2&&i!=a3) return i;
}
int main(){
	n=read();
	m=read();
	fr(i,1,n) scanf("%s",s[i]+1);
	fr(i,1,m) f[n+1][i]=-1;
	pfr(i,n,1){
		ll pos=0;
		fr(j,1,m) if(s[i][j]=='#') pos=j;
		if(pos){
			fr(j,0,m-1){
				ll now=(pos+j-1)%m+1;
				if(s[i][now]=='#') l[now]=-1;
				else l[now]=calc(l[L(now)],f[i+1][now]);
			}
			pfr(j,m,1){
				ll now=(pos+j-1)%m+1;
				if(s[i][now]=='#') r[now]=-1;
				else r[now]=calc(r[R(now)],f[i+1][now]);
			}
			fr(j,1,m) f[i][j]=calc(l[L(j)],r[R(j)],f[i+1][j]);
		}
		else if(m==1) f[i][1]=calc(f[i+1][1]);
		else{
			fr(j,0,3) lto[1][j]=rto[m][j]=lft[1][j]=rgt[m][j]=j;
			fr(j,2,m) fr(k,0,3) lto[j][k]=lto[j-1][calc(k,f[i+1][j-1])];
			pfr(j,m-1,1) fr(k,0,3) rto[j][k]=rto[j+1][calc(k,f[i+1][j+1])];
			fr(j,2,m) fr(k,0,3) lft[j][k]=calc(lft[j-1][k],f[i+1][j]);
			pfr(j,m-1,1) fr(k,0,3) rgt[j][k]=calc(rgt[j+1][k],f[i+1][j]);
			fr(j,1,m){
				if(j==1) f[i][j]=calc(rto[j+1][calc(f[i+1][j+1])],rgt[j+1][calc(f[i+1][m])],f[i+1][j]);
				else if(j==m) f[i][j]=calc(lto[j-1][calc(f[i+1][j-1])],lft[j-1][calc(f[i+1][1])],f[i+1][j]);
				else{
					ll tmp1=lft[j-1][calc(rto[j+1][calc(f[i+1][j+1])],f[i+1][1])],tmp2=rgt[j+1][calc(lto[j-1][calc(f[i+1][j-1])],f[i+1][m])];
					f[i][j]=calc(tmp1,tmp2,f[i+1][j]);
				}
			}
		}
		fr(j,1,m) if(s[i][j]=='#') f[i][j]=-1;
	}
	ll ans=0;
	fr(i,1,n) fr(j,1,m) if(s[i][j]=='B') ans^=f[i][j];
	if(ans) pf("Alice");
	else pf("Bob");
}