import sys
for line in sys.stdin.readlines()[1:]:
li = list(line.strip())
ret = []
for c in li:
if c not in map(lambda x:x[0], ret):
ret.append((c, li.count(c)))
ret.sort(key=lambda x:x[1], reverse=True)
pre = ret[0][0]
value = 26
total = 0
for k,v in ret:
if k != pre:
pre = k
value -= 1
total += value * v
print(total)


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