while True:
try:
n = int(input())
for i in range(n):
s = input().strip()
d = {}
for i in s:
if i in d.keys():
d[i]+=1
else:
d[i]=1
l = sorted(d.values(),reverse=True)
# print(l)
Sum = 0
a = 26
for i in l:
Sum += a*i
a -= 1
print(Sum)
except:
break

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