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#include<iostream>
using namespace std;
int main() {
int s, n, a;
cin >> s >> n;
int cnt = 1;
for (int i = 1; i <= n; i++) {
cin >> a;
if (a > s)cnt++;
}
if (cnt <= n * 0.1)cout << "A";
else if (cnt <= n * 0.3)cout << "B";
else if (cnt <= n * 0.6)cout << "C";
else if (cnt <= n * 0.8)cout << "D";
else cout << "E";
return 0;
}