#include<bits/stdc++.h>
using namespace std;
long long n,m,r,c;
char a[1000][1000];
int main(){
	cin>>r>>c>>n>>m;
	for(int i=1;i<=r;i++){
		for(int j=1;j<=c;j++){
			cin>>a[i][j];
		}
	}
	int cnt=0;
	for(int i=1;i<=r;i++){
		for(int j=1;j<=c;j++){
			if(a[i][j]=='M'){
				bool p=1;
				int c=0;
				for(int x=1;x<=i;x++){
					if(a[x][j]=='F') p=0;
				}
				if(p==1) c++;
				p=1;
				for(int x=i;x<=r;x++){
					if(a[x][j]=='F') p=0;
				}
				if(p==1) c++;
				p=1;
				for(int x=1;x<=j;x++){
					if(a[i][x]=='F') p=0;
				}
				if(p==1) c++;
				p=1;
				for(int x=j;x<=c;x++){
					if(a[i][x]=='F') p=0;
				}
				if(p==1) c++;
				if(c>=3) cnt++;
			}
			else if(a[i][j]=='F'){
				bool p=1;
				int c=0;
				for(int x=1;x<=i;x++){
					if(a[x][j]=='M') p=0;
				}
				if(p==1) c++;
				p=1;
				for(int x=i;x<=r;x++){
					if(a[x][j]=='M') p=0;
				}
				if(p==1) c++;
				p=1;
				for(int x=1;x<=j;x++){
					if(a[i][x]=='M') p=0;
				}
				if(p==1) c++;
				p=1;
				for(int x=j;x<=c;x++){
					if(a[i][x]=='M') p=0;
				}
				if(p==1) c++;
				if(c>=3) cnt++;
			}
		}
	}
	cout<<cnt;
	return 0;
}