while True:
try:
n = int(input())
m = []
for _ in range(n):
m.append(input())
for x in m:
cnt_lst = []
for i in set(str(x)):
cnt_lst.append(str(x).count(i))
cnt_lst.sort(reverse=True)
score = 26
max_scoresum = 0
for j in range(len(cnt_lst)):
max_scoresum += (score - j) * cnt_lst[j]
print(max_scoresum)
except:
break

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