#include<bits/stdc++.h>
using namespace std;
int n,m,f[1100][1100],L[1100],R[1100],mx[11][11][11];
int Lpre[1100][4],Lsuf[1100][4],Rpre[1100][4],Rsuf[1100][4];
bool a[1100][1100],b[1100][1100]; char tmp[1100];
inline int mex(int x,int y,int z){ return mx[x+1][y+1][z+1];}
inline int mex(int x,int y){ return mex(x,y,-1);}
inline int mex(int x){ return mex(x,-1,-1);}
inline int getL(int x){ return (x==1?m:x-1);}
inline int getR(int x){ return (x==m?1:x+1);}
int dfsL(int i,int j){
	if (!a[i][j]) return -1;
	if (L[j]!=-1) return L[j];
	return (L[j]=mex(f[i+1][j],dfsL(i,getL(j))));
}
int dfsR(int i,int j){
	if (!a[i][j]) return -1;
	if (R[j]!=-1) return R[j];
	return (R[j]=mex(f[i+1][j],dfsR(i,getR(j))));
}
int main(){
	for (int x=0;x<=5;x++)
		for (int y=0;y<=5;y++)
			for (int z=0;z<=5;z++)
				for (int i=1;i<=5;i++)
					if (x!=i&&y!=i&&z!=i){
						mx[x][y][z]=i-1;
						break;
					}
	scanf("%d%d",&n,&m);
	for (int i=1;i<=n;i++){
		scanf("%s",tmp+1);
		for (int j=1;j<=m;j++)
			if (tmp[j]=='#') a[i][j]=false;
			else{
				a[i][j]=true;
				if (tmp[j]=='B') b[i][j]=true;
			}
	}
	memset(f,-1,sizeof(f));
	for (int i=n;i>=1;i--){
		bool flag=true;
		for (int j=1;j<=m;j++) flag=flag&&a[i][j];
		if (!flag){
			if (m==1) continue;
			for (int j=1;j<=m;j++) L[j]=-1,R[j]=-1;
			for (int j=1;j<=m;j++) dfsL(i,j),dfsR(i,j);
			for (int j=1;j<=m;j++)
				if (a[i][j]) f[i][j]=mex(f[i+1][j],L[getL(j)],R[getR(j)]);
		} else{
			if (m==1){ f[i][1]=mex(f[i+1][1]); continue;}
			for (int k=0;k<=2;k++) Lpre[1][k]=k;
			for (int j=2;j<=m;j++)
				for (int k=0;k<=2;k++) Lpre[j][k]=mex(Lpre[j-1][k],f[i+1][j]);//1号点为k，这个点的值
			for (int k=0;k<=2;k++) Lsuf[m][k]=k;
			for (int j=m-1;j>=1;j--)
				for (int k=0;k<=2;k++) Lsuf[j][k]=Lsuf[j+1][mex(k,f[i+1][j+1])];//这个点为k，m号点的值
			
			for (int k=0;k<=2;k++) Rpre[m][k]=k;
			for (int j=m-1;j>=1;j--)
				for (int k=0;k<=2;k++) Rpre[j][k]=mex(Rpre[j+1][k],f[i+1][j]);//m号点为k，这个点的值
			for (int k=0;k<=2;k++) Rsuf[1][k]=k;
			for (int j=2;j<=m;j++)
				for (int k=0;k<=2;k++) Rsuf[j][k]=Rsuf[j-1][mex(k,f[i+1][j-1])];//这个点为k，1号点的值
			f[i][1]=mex(f[i+1][1],Lsuf[2][mex(f[i+1][2])],Rpre[2][mex(f[i+1][m])]);
			f[i][m]=mex(f[i+1][m],Lpre[m-1][mex(f[i+1][1])],Rsuf[m-1][mex(f[i+1][m-1])]);
			for (int j=2;j<=m-1;j++) f[i][j]=mex(f[i+1][j],Lpre[j-1][mex(f[i+1][1],Lsuf[j+1][mex(f[i+1][j+1])])],Rpre[j+1][mex(f[i+1][m],Rsuf[j-1][mex(f[i+1][j-1])])]);
		}
	}
	int ans=0;
	for (int i=1;i<=n;i++)
		for (int j=1;j<=m;j++)
			if (b[i][j]) ans^=f[i][j];
	if (ans) puts("Alice");
	else puts("Bob");
	return 0;
}