20221206

# # n = input()
# #
# # data = [0] * 26
# #
# # for i in n:
# # #     # print(ord(i))
# # #     if 97 <= ord(i) <= 122:
# # #         # print(i)
# # #         data[ord(i)-97] += 1
# # #
# # # for
# # #
# #
# #     if 97 <= ord(i) and ord(i) <= 122:
# #         data[ord(i)-97] +=1
# # for i in range(0, 26):
# #     print(chr(i+97) + ':' + str(data[i]))
# #
# # # 0 ~ 26: data[0], data[1] ,..., data[110] (x) : data[0] ~ data[25]
# # F = 0
# # M = 0
# #
# # n=int(input())
# # for i in range(n):
# #     data = input().split(',')
# #     if data[1] == 'F':
# #         F += 1
# #     else:
# #         M += 1
# # print(M)
# # print(F)
# #
# #
# A = 0
#
# n =int(input())
# for i in range(n):
#     data = input().split(',')
#     A += int(data[2])
# A = A/n
# print('%.2f' %A)
#
# F = 0
#
# n=int(input())
# for i in range(n):
#     data = input().split(',')
#     F += int(len(data)-3)
# F = F/n
# print('%.2f' %F)