import sys
while True:
try:
n= int(input())
b=[]
for i in range(n):
b.append(input())
for i in range(n):
sum=0
l = list(b[i])
s = set(b[i])
cnt =[]
for j in s:
cnt.append(l.count(j))
sn = len(cnt)
cnt.sort(reverse=True)
for k in range(sn):
sum += cnt[k]*(26-k)
print(sum)
except:
break

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