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

namespace FastIO
{

class FastIOBase
{
 protected:
#ifdef OPENIOBUF
	static const int BUFSIZE=1<<22;
	char buf[BUFSIZE+1];
	int buf_p=0;
#endif
	FILE *target;
 public:
#ifdef OPENIOBUF
	virtual void flush()=0;
#endif
	FastIOBase(FILE *f): target(f){}
	~FastIOBase()=default;
};

class FastOutput: public FastIOBase
{
#ifdef OPENIOBUF
 public:
	inline void flush()
		{ fwrite(buf,1,buf_p,target),buf_p=0; }
#endif
 protected:
	inline void __putc(char x)
	{
#ifdef OPENIOBUF
		if(buf[buf_p++]=x,buf_p==BUFSIZE)flush();
#else
		putc(x,target);
#endif
	}
	template<typename T>
	inline void __write(T x)
	{
		static char stk[64],*top;top=stk;
		if(x<0) return __putc('-'),__write(-x);
		do *(top++)=x%10,x/=10; while(x);
		for(;top!=stk;__putc(*(--top)+'0'));
	}
 public:
	FastOutput(FILE *f=stdout): FastIOBase(f){}
#ifdef OPENIOBUF
	inline void setTarget(FILE *f) { this->flush(),target=f; }
	~FastOutput(){ flush(); }
#else
	inline void setTarget(FILE *f) { target=f; }
#endif
	template<typename ...T>
	inline void writesp(const T &...x)
		{ initializer_list<int>{(this->operator<<(x),__putc(' '),0)...}; }
	template<typename ...T>
	inline void writeln(const T &...x)
		{ initializer_list<int>{(this->operator<<(x),__putc('\n'),0)...}; }
	inline FastOutput &operator <<(char x)
		{ return __putc(x),*this; }
	inline FastOutput &operator <<(const char *s)
		{ for(;*s;__putc(*(s++)));return *this; }
	inline FastOutput &operator <<(const string &s)
		{ return (*this)<<s.c_str(); }
	template<typename T,typename=typename enable_if<is_integral<T>::value>::type>
	inline FastOutput &operator <<(const T &x)
		{ return __write(x),*this; }
}qout;

class FastInput: public FastIOBase
{
#ifdef OPENIOBUF
 public:
	inline void flush()
		{ buf[fread(buf,1,BUFSIZE,target)]='\0',buf_p=0; }
#endif
 protected:
	inline char __getc()
	{
#ifdef OPENIOBUF
		if(buf_p==BUFSIZE) flush();
		return buf[buf_p++];
#else
		return getc(target);
#endif
	}
 public:
#ifdef OPENIOBUF
	FastInput(FILE *f=stdin): FastIOBase(f){ buf_p=BUFSIZE; }
	inline void setTarget(FILE *f) { this->flush(),target=f; }
#else
	FastInput(FILE *f=stdin): FastIOBase(f){}
	inline void setTarget(FILE *f) { target=f; }
#endif
	inline char getchar() { return __getc(); }
	template<typename ...T>
	inline void read(T &...x)
		{ initializer_list<int>{(this->operator>>(x),0)...}; }
	inline FastInput &operator >>(char &x)
		{ while(isspace(x=__getc()));return *this; }
	template<typename T,typename=typename enable_if<is_integral<T>::value>::type>
	inline FastInput &operator >>(T &x)
	{
		static char ch,sym;x=sym=0;
		while(isspace(ch=__getc()));
		if(ch=='-') sym=1,ch=__getc();
		for(;isdigit(ch);x=(x<<1)+(x<<3)+(ch^48),ch=__getc());
		return sym?x=-x:x,*this;
	}
	inline FastInput &operator >>(char *s)
	{
		while(isspace(*s=__getc()));
		for(;!isspace(*s) && *s && ~*s;*(++s)=__getc());
		return *s='\0',*this;
	}
	inline FastInput &operator >>(string &s)
	{
		char str_buf[(1<<8)+1],*p=str_buf;
		char *const buf_end=str_buf+(1<<8);
		while(isspace(*p=__getc()));
		for(s.clear(),p++;;p=str_buf)
		{
			for(;p!=buf_end && !isspace(*p=__getc()) && *p && ~*p;p++);
			*p='\0',s.append(str_buf);
			if(p!=buf_end) break;
		}
		return *this;
	}
}qin;

} // namespace FastIO
using namespace FastIO;

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)
#else
#define FILEIO(file)
#endif

int n,m,cr[1005],cc[1005];
bool vr[1005],vc[1005];
char S[1005][1005],T[1005][1005];
queue<pair<int,int>> q;
inline void check(int x,int y)
{
	if(T[x][y]=='O') return;
	if(T[x][y]=='X' && cr[x]==1 && cc[y]==1) q.emplace(x,y);
	if(T[x][y]=='?' && cr[x]==0 && cc[y]==0) q.emplace(x,y);
}
inline void del(int x,int y)
{
	if(T[x][y]!='X') return;
	cr[x]--,cc[y]--;
	if(cr[x]<=1) for(int i=1;i<=m;i++) check(x,i);
	if(cc[y]<=1) for(int i=1;i<=n;i++) check(i,y);
}
inline bool getans()
{
	for(int i=1;i<=n;i++) for(int j=1;j<=m;j++)
		if(T[i][j]!='?' && S[i][j]!=T[i][j]) return false;
	for(int i=1;i<=n;i++) for(int j=1;j<=m;j++)
		if(T[i][j]=='?' && S[i][j]=='O') return true;
	return false;
}
int main()
{
	qin>>n>>m;
	for(int i=1;i<=n;i++) qin>>(S[i]+1);
	for(int i=1;i<=n;i++) qin>>(T[i]+1);
	for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) if(T[i][j]=='X') cr[i]++,cc[j]++;
	for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) check(i,j);
	while(!q.empty())
	{
		auto [x,y]=q.front();q.pop();
		if(!vr[x]) for(int i=1;i<=m;i++) del(x,i),T[x][i]='?';
		if(!vc[y]) for(int i=1;i<=n;i++) del(i,y),T[i][y]='?';
		if(!vr[x]) for(int i=1;i<=m;i++) check(x,i);
		if(!vc[y]) for(int i=1;i<=n;i++) check(i,y);
		vr[x]=vc[y]=true;
	}
	qout<<(int)getans();
	return 0;
}