def Group(x):
List=[]
Sum=0
for i in x:
List.append(i)
if len(set(List))==len(List):
return True
else:
CopyList=List.copy()
for i in set(List):
CopyList.remove(i)
for j in CopyList:
if j*(List.count(j)) in x:
Sum=0
else:
Sum+=1
if Sum==0:
return True
N=int(input())
Sum=0
for i in range(N):
S=input()
if Group(S)==True:
Sum+=1
S=''
print(Sum)
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