try:    
    while 1:
        n=int(input())
        s=set()
        for i in range (n):
            num = input()
            booleans = [str(j) in num for j in range(10)]
            string = ""
            for b in booleans:string += str(int(b))
            s.add(string)
        print(len(s))
except:
    pass