#include<bits/stdc++.h>
using namespace std;
const int N=2e3+1;
char a[N][N];
int xx[4]={0,0,1,-1};
int yy[4]={1,-1,0,0};
bool vis[N][N];
void dfs(int py, int px, char c){
a[py][px]='?';
vis[py][px]=1;
for(int i=0;i<4;i++){
if((a[py+yy[i]][px+xx[i]]=='?' or a[py+yy[i]][px+xx[i]]==c) and vis[py+yy[i]][px+xx[i]]==0){
dfs(py+yy[i],px+xx[i],c);
}
}
}
signed main(){
int n,m;
cin>>n>>m;
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
cin>>a[i][j];
}
}
int cnt=0;
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
if(a[i][j]=='F' or a[i][j]=='R'){
for(int x=1;x<=n;x++){
for(int y=1;y<=m;y++)vis[x][y]=0;
}
dfs(i,j,a[i][j]);
cnt++;
i=1;
j=1;
}
}
}
cout<<cnt;
}
