#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define int long long
#define maxn 1005
#define mi LLONG_MIN
#define ma LLONG_MAX
#define mod 1000000007
#define pb push_back
#define S second
#define F first
vector<vector<int>> a(maxn, vector<int>(maxn, 0));
int n, m;
void bfs(int i, int j) {
int last = a[i][j];
queue<pair<int, int>> q;
q.push({i, j});
vector<int> dx = {1, -1, 0, 0};
vector<int> dy = {0, 0, 1, -1};
while (!q.empty()) {
int x = q.front().F, y = q.front().S;
q.pop();
if (a[x][y] != last) continue;
a[x][y] = 0;
for (int k = 0; k < 4; k++) {
int nx = x + dx[k];
int ny = y + dy[k];
if (nx >= 0 && nx < n && ny >= 0 && ny < m) {
if (a[nx][ny] == last) {
q.push({nx, ny});
}
}
}
}
}
int32_t main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin >> n >> m;
vector<pair<int, int>> v;
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
char x;
cin >> x;
if (x == 'T') {
a[i][j] = 1;
if ((i == 0 || a[i - 1][j] != 1) &&
(j == 0 || a[i][j - 1] != 1)) {
v.pb({i, j});
}
} else if (x == 'B') {
a[i][j] = 2;
if ((i == 0 || a[i - 1][j] != 2) &&
(j == 0 || a[i][j - 1] != 2)) {
v.pb({i, j});
}
}
}
}
int ans = 0;
for (auto [i, j] : v) {
if (a[i][j] == 0) continue;
bfs(i, j);
ans++;
}
cout << ans;
}
