#include <bits/stdc++.h>
using namespace std;
#define OPENIOBUF

namespace FastIO
{

class FastIOBase
{
 protected:
#ifdef OPENIOBUF
	static const int BUFSIZE=1<<16;
	char buf[BUFSIZE+1];
	int buf_p=0;
#endif
	FILE *target;
	FastIOBase(FILE *f): target(f){}
	~FastIOBase()=default;
 public:
#ifdef OPENIOBUF
	virtual void flush()=0;
#endif
};

class FastOutput final: public FastIOBase
{
 public:
	FastOutput(FILE *f=stdout): FastIOBase(f) {}
#ifdef OPENIOBUF
	~FastOutput() { flush(); }
	void flush() { fwrite(buf,1,buf_p,target),buf_p=0; }
#endif
	void put(char x)
	{
#ifdef OPENIOBUF
		if(buf[buf_p++]=x,buf_p==BUFSIZE) flush();
#else
		putc(x,target);
#endif
	}
	FastOutput &operator <<(char x)
	{ return put(x),*this; }
	FastOutput &operator <<(const char *s)
	{ for(;*s;put(*(s++)));return *this; }
	FastOutput &operator <<(const std::string &s)
	{ return (*this)<<s.c_str(); }
	template<typename T>
	std::enable_if_t<std::is_integral<T>::value,FastOutput&> operator <<(T x)
	{
		if(x<0) return put('-'),(*this)<<(-x);
		char stk[numeric_limits<T>::digits10+1],*top=stk;
		do *(top++)=x%10+'0',x/=10; while(x);
		while(top!=stk) put(*(--top));
		return *this;
	}
	template<typename ...T>
	void writesp(T &&...x)
	{ std::initializer_list<int>{((*this)<<(x),put(' '),0)...}; }
	template<typename ...T>
	void writeln(T &&...x)
	{ std::initializer_list<int>{((*this)<<(x),put('\n'),0)...}; }
	template<typename Iter>
	void writesp(Iter begin,Iter end)
	{ while(begin!=end) (*this)<<*(begin++)<<' '; }
	template<typename Iter>
	void writeln(Iter begin,Iter end)
	{ while(begin!=end) (*this)<<*(begin++)<<'\n'; }
}qout;

class FastInput final: public FastIOBase
{
 private:
	bool __eof;
 public:
	FastInput(FILE *f=stdin): FastIOBase(f),__eof(false)
#ifdef OPENIOBUF
	{ buf_p=BUFSIZE; }
	void flush() { buf[fread(buf,1,BUFSIZE,target)]=EOF,buf_p=0; }
	bool eof()const { return buf[buf_p]==EOF; }
#else
	{}
	bool eof()const { return feof(target); }
#endif
	char get()
	{
		if(__eof) return EOF;
#ifdef OPENIOBUF
		if(buf_p==BUFSIZE) flush();
		char ch=buf[buf_p++];
#else
		char ch=getc(target);
#endif
		return ~ch?ch:(__eof=true,EOF);
	}
	void unget(char c)
	{
		__eof=false;
#ifdef OPENIOBUF
		buf[--buf_p]=c;
#else
		ungetc(c,target);
#endif
	}
	explicit operator bool()const { return !__eof; }
	FastInput &operator >>(char &x)
	{ while(isspace(x=get()));return *this; }
	template<typename T>
	std::enable_if_t<std::is_integral<T>::value,FastInput&> operator >>(T &x)
	{
		char ch,sym=0;x=0;
		while(isspace(ch=get()));
		if(__eof) return *this;
		if(ch=='-') sym=1,ch=get();
		for(;isdigit(ch);x=(x<<1)+(x<<3)+(ch^48),ch=get());
		return unget(ch),sym?x=-x:x,*this;
	}
	FastInput &operator >>(char *s)
	{
		while(isspace(*s=get()));
		if(__eof) return *this;
		for(;!isspace(*s) && !__eof;*(++s)=get());
		return unget(*s),*s='\0',*this;
	}
	FastInput &operator >>(std::string &s)
	{
		char str_buf[(1<<8)+1]={0},*p=str_buf;
		char *const buf_end=str_buf+(1<<8);
		while(isspace(*p=get()));
		if(__eof) return *this;
		for(s.clear(),p++;;p=str_buf)
		{
			for(;p!=buf_end && !isspace(*p=get()) && !__eof;p++);
			if(p!=buf_end) break;
			s.append(str_buf);
		}
		unget(*p),*p='\0',s.append(str_buf);
		return *this;
	}
	template<typename ...T>
	void read(T &&...x)
	{ std::initializer_list<int>{((*this)>>(x),0)...}; }
	template<typename Iter>
	void read(Iter begin,Iter end)
	{ while(begin!=end) (*this)>>*(begin++); }
}qin;

} // namespace FastIO
using FastIO::qin,FastIO::qout;

using LL=long long;
using LD=long double;
using UI=unsigned int;
using ULL=unsigned long long;

#ifndef DADALZY
#define FILEIO(file) freopen(file".in","r",stdin),freopen(file".out","w",stdout)
#define LOG(...) [](auto...){}(__VA_ARGS__)
#else
#define FILEIO(file)
#define LOG(...) fprintf(stderr,__VA_ARGS__)
#endif

int n,m;
char s[1005][1005];

inline int mex(int x=-1,int y=-1,int z=-1)
{
	for(int i=0;;i++)
		if(x!=i && y!=i && z!=i)
			return i;
}

int sg[1005][1005];
void solve1(int d)
{
	static int fl[4][1005],gl[1005][4],fr[4][1005],gr[1005][4];
	for(int k=0;k<4;k++)
	{
		fl[k][1]=mex(sg[d+1][1],k);
		for(int i=2;i<=m;i++)
			fl[k][i]=mex(fl[k][i-1],sg[d+1][i]);
		fr[k][m]=mex(sg[d+1][m],k);
		for(int i=m-1;i>=1;i--)
			fr[k][i]=mex(fr[k][i+1],sg[d+1][i]);
	}
	for(int k=0;k<4;k++) gl[m][k]=k,gr[1][k]=k;
	for(int i=m-1;i>=1;i--)
		for(int k=0;k<4;k++)
			gl[i][k]=gl[i+1][mex(k,sg[d+1][i+1])];
	for(int i=2;i<=m;i++)
		for(int k=0;k<4;k++)
			gr[i][k]=gr[i-1][mex(k,sg[d+1][i-1])];
	for(int i=1;i<=m;i++)
	{
		if(s[d][i]=='#') { sg[d][i]=-1;continue; }
		int sgL=(i==1?gl[i][3]:fl[gl[i][3]][i-1]),
			sgR=(i==m?gr[i][3]:fr[gr[i][3]][i+1]);
		sg[d][i]=mex(sgL,sgR,sg[d+1][i]);
	}
}
void solve2(int d)
{
	static int L[1005],R[1005];
	auto pre=[&](int i) { return i==1?m:i-1; };
	auto nxt=[&](int i) { return i==m?1:i+1; };
	int st=find(s[d]+1,s[d]+n+1,'#')-s[d];
	fill(L+1,L+m+1,-1);
	for(int i=nxt(st),lst=st;i!=st;lst=i,i=nxt(i))
		if(s[d][i]!='#')
			L[i]=mex(L[lst],sg[d+1][i]);
	fill(R+1,R+m+1,-1);
	for(int i=pre(st),lst=st;i!=st;lst=i,i=pre(i))
		if(s[d][i]!='#')
			R[i]=mex(R[lst],sg[d+1][i]);
	for(int i=1;i<=m;i++)
	{
		if(s[d][i]=='#') { sg[d][i]=-1;continue; }
		sg[d][i]=mex(L[pre(i)],R[nxt(i)],sg[d+1][i]);
	}
}

int main()
{
	qin>>n>>m;
	for(int i=1;i<=n;i++) qin>>(s[i]+1);
	fill(sg[n+1]+1,sg[n+1]+m+1,-1);
	for(int i=n;i>=1;i--)
	{
		if(m==1)
			sg[i][1]=(s[i][1]=='#'?-1:mex(sg[i+1][1]));
		else if(count(s[i]+1,s[i]+m+1,'#')==0)
			solve1(i);
		else solve2(i);
	}
	int res=0;
	for(int i=1;i<=n;i++)
		for(int j=1;j<=m;j++)
			if(s[i][j]=='B') res^=sg[i][j];
	qout<<(res?"Alice":"Bob");
	return 0;
}
/*
2 4
B..B
....

*/