from ast import arg
import numpy as np

N = input()
A = list(map(int, input().split()))
rate = 44100
fft_data = np.abs(np.fft.rfft(A))
freqList = np.fft.rfftfreq(len(A), 1.0 / rate)  # 横軸
Max = 0
argmax = -1
for i in range(len(fft_data)):
    if Max < freqList[i]:
        Max = freqList[i]
        argmax = fft_data[i]

print(argmax)
v = [261.6, 294.3, 327.0, 348.8, 392.4, 436.0, 490.5]
ans = ["C4", "D4", "E4", "F4", "G4", "A4", "B4"]

Min = 1000
argmin = -1
for i in range(len(v)):
    if np.abs(v[i]-argmax) < Min:
        Min = np.abs(v[i]-argmax)
        argmin = i

print(ans[argmin])