#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef int64_t lint;
#define rep(i, n) for(int i=0; i<n; i++)
#define repx(i, l, n) for(int i=l; i<n; i++)
#define all(v) v.begin(), v.end()
#define show(x) cout << #x << ": " << x << endl;
#define list(x) cout << #x << ": " << x << "  ";
#define pb push_back
using vi = vector<lint>;
using vvi = vector<vector<lint>>;
template<class T> inline void vin(vector<T>& v) { rep(i, v.size()) cin >> v.at(i); }
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
template<class T> inline void drop(T x) { cout << x << endl; exit(0); }
template<class T> void vout(vector<T> v) { rep(i, v.size()) { cout << v.at(i) << ' '; } cout << endl; }
constexpr lint LINF = LLONG_MAX/2;

int main() {
	lint N, M;
	cin >> N >> M;
	std::vector<string> v(N);
	vin(v);

	lint a=0, b=0, c=0, x, y, z;
	string s = v[0];
	map<string, int> m;
	rep(i, N) {
		rep(j, M+1) {
			rep(k, 26) {
				if (j != M && k == v[i][j]-'a') continue;
				string t = v[i].substr(0, j) + char('a'+k) + v[i].substr(j, M-j);
				if (m[t] < i) continue;
				m[t]++;
			}
		}
	}
	for (auto p : m) {
		if (p.second == N) c++;
	}
	std::cout << c << '\n';
}