#include #define rep(i,n) for(int i = 0; i < (int)(n); i++) using namespace std; int main(){ int N; cin >> N; vector A(N); rep(i,N) cin >> A[i]; string code[7] = {"C4", "D4", "E4", "F4", "G4", "A4", "B4"}; int f[7] = {2616, 2943, 3270, 3488, 3924, 4360, 4905}; int max_dif[7] = {0}; vector> val(7); rep(i,7){ rep(j,8){ val[i].emplace_back(A[j*f[i]]); } } rep(i,7) sort(val[i].begin(), val[i].end()); rep(i,7) max_dif[i] = val[i][7] - val[i][0]; int ans = -1, res = 1e9; rep(i,7){ if(max_dif[i] < res){ res = max_dif[i]; ans = i; } } cout << code[ans] << endl; return 0; }