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>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
#define in(x) freopen(x, "r", stdin)
#define out(x) freopen(x, "w", stdout)
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("-O3")
#define F first
#define S second
#define pb push_back
#define N +50050
//#define N1 +1001000
#define M ll(998244353)
#define sz(x) (int)x.size()
#define re return
#define oo ll(1e18)
#define el '\n'
using namespace std;
//using namespace __gnu_pbds;
//typedef tree <int, null_type, less_equal <int> , rb_tree_tag, tree_order_statistics_node_update> ordered_set;
typedef long long ll;
typedef long double ld;
int n, m, i, j;
string s[N];
ll ans;
bitset <N> bt[10][30];
bitset <N> nw, full;
int main()
{
srand(time(0));
ios_base::sync_with_stdio(0);
iostream::sync_with_stdio(0);
ios::sync_with_stdio(0);
cin.tie(NULL);
cout.tie(NULL);
// in("input.txt");
// out("output.txt");
cin >> n >> m;
for (i = 1; i <= n; i++)
{
cin >> s[i];
for (j = 0; j < m; j++)
{
if (s[i][j] == '?') continue;
int c = s[i][j] - 'a';
bt[j][c][i] = 1;
}
}
for (i = 0; i < n; i++) full[i] = 1;
for (i = 0; i < n; i++)
{
nw = full;
for (j = 0; j < m; j++)
{
if (s[i][j] == '?') continue;
nw &= bt[j][s[i][j] - 'a'];
}
ans += nw.count();
full[i] = 0;
}
cout << ans;
}
//3 - 4
//4 - 5
//y < z + x < y + 2 * x
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