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#include <bits/stdc++.h> | |
using namespace std; | |
//#define int long long | |
#define FOR(i, j, k) for(int i = j; i < (int)k; ++i) | |
#define rep(i, j) FOR(i, 0, j) | |
#define INF (1 << 30) | |
typedef unsigned long long ull; | |
typedef pair<int, int> P; | |
typedef pair<P, int> Pi; | |
const int MOD = 1e9 + 7; | |
const int dy[] = {0, 0, 1, -1}; | |
const int dx[] = {1, -1, 0, 0}; | |
template <class T> void chmin(T& a, const T& b) { a = min(a, b); } | |
template <class T> void chmax(T& a, const T& b) { a = max(a, b); } | |
string s[100]; | |
bool went[100][100]; | |
int h, w, cnt; | |
void dfs(int y, int x, char t) { | |
if(went[y][x]) return; | |
went[y][x] = true; | |
++cnt; | |
rep(i, 4) { | |
int nx = x + dx[i], ny = y + dy[i]; | |
if(nx < 0 || nx >= w || ny < 0 || ny >= h) continue; | |
if(s[ny][nx] == t) { | |
dfs(ny, nx, t); | |
} | |
} | |
} | |
signed main() { | |
cin.tie(0); | |
ios::sync_with_stdio(false); | |
while((cin >> h >> w), h | w) { | |
rep(i, h) cin >> s[i]; | |
int res = 0; | |
cnt = 0; | |
memset(went, 0, sizeof(went)); | |
rep(i, h) rep(j, w) { | |
cnt = 0; | |
dfs(i, j, s[i][j]); | |
if(cnt > 0) ++res; | |
} | |
cout << res << endl; | |
} | |
return 0; | |
} |
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