while True:
try:
m = int(input())
for s in range(m):
name = input()
result = 0
lists = list(set(name))
list1 = sorted(lists, key=lambda x: name.count(x), reverse=True)
time = 26
for i in range(len(lists)):
result += name.count(list1[i]) * time
time -= 1
print(result)
except:
break