This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define sz(x) int(x.size())
#define in(x) freopen(x, "r", stdin)
#define out(x) freopen(x, "w", stdout)
#define N 100500
#define oo ll(1e16)
#define ft first
#define sd second
#define mp make_pair
#define pb push_back
#define ppb pop_back
#define el '\n'
#define elf endl
#define base ll(1e9 + 7)
using namespace std;
typedef long long ll;
typedef long double ld;
int n, m, ans;
string s[N];
int main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
// in("input.txt");
cin >> n >> m;
for (int i = 0; i < n; i++)
cin >> s[i];
for (int i = 0; i < n; i++)
for (int j = i + 1; j < n; j++) {
bool f = 1;
for (int t = 0; t < m; t++)
if (s[i][t] != '?' && s[j][t] != '?')
f &= (s[i][t] == s[j][t]);
ans += f;
}
cout << ans;
}
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