[question brushing] character statistics [0]

One 、 subject

1. Title Description

subject ： Give a character set , Please judge the number of different characters
Input ： The input line , The length is in 1000 Only lowercase letters are included 、‘{’、‘}’ And Spaces
Output ： Output one line , Indicates the number of different letters appearing
Example :

Two 、 Problem solving report

1. Thought analysis

• 1. Replace spaces first
• 2. exclude {}, interfere
• 3. Count

2. Code details

python

a=input()
while(a.find(" ")>0):
    a=a.replace(" ","")
b=list(a)
c=[]
d=[',','{','}',]
# print(b)
for i in range(len(b)):
        if b[i]!=d[0] and b[i]!=d[1] and b[i]!=d[2]:
            c.append(b[i])
# print(c)
e={
    }.fromkeys(c).keys()
print(len(e))