#include <bits/stdc++.h>
#define For(i,a,b) for(int i=a;i<=b;i++)
#define Rev(i,a,b) for(int i=a;i>=b;i--)
#define Fin(file) freopen(file,"r",stdin)
#define Fout(file) freopen(file,"w",stdout)
using namespace std; using ll = long long;
const int N=1e3+5;
char mp1[N][N],mp2[N][N]; int n,m,visr[N],visc[N],cntr[N],cntc[N];
int main(){
	cin>>n>>m; For(i,1,n) cin>>(mp1[i]+1);; For(i,1,n) cin>>(mp2[i]+1);
	int sm=1; For(i,1,n) For(j,1,m) if(mp1[i][j]!=mp2[i][j]) { sm=0; break; }
	if(sm) cout<<"1\n",exit(0);
	For(i,1,n) For(j,1,m) if(mp2[i][j]=='X') cntr[i]++,cntc[j]++;
	while(true){
		int ok=0;
		For(i,1,n) For(j,1,m) if( (mp2[i][j]=='X'&&cntr[i]==1&&cntc[i]==1) || (mp2[i][j]=='.'&&cntr[i]==0&&cntr[j]==0&&(!visr[i]||!visc[j])) ){
			visr[i]=visc[j]=1;
			For(k,1,m) cntr[i]-=mp2[i][k]=='X',cntc[k]-=mp2[i][k]=='X',mp2[i][k]='.';
			For(k,1,n) cntr[k]-=mp2[k][j]=='X',cntc[j]-=mp2[k][j]=='X',mp2[k][j]='.';
			ok=1;
		}
		if(!ok) break;
	}
	//~ For(i,1,n) cout<<mp2[i]+1<<'\n';
	int ok1=0; For(i,1,n) For(j,1,m) if(mp2[i][j]=='.'&&mp1[i][j]=='O') ok1=1;
	int ok2=1; For(i,1,n) For(j,1,m) if(mp2[i][j]!='.'&&mp2[i][j]!=mp1[i][j]) ok2=0;
	cout<<(ok1&ok2)<<'\n';
	return 0;
}