这个查字符串中的各字母出现个数怎么看

a=input()
b=input()
print(len(a.split(b))-1)

s＝input()
res = {}
for i in str:
    res[i]=res.get(i,0)+1
print(res)

#!/usr/bin/python
# -*- coding: UTF-8 -*-
"""
@author: Roc-xb
"""
if __name__ == '__main__':
    str = "jadklfjlakjflkdjaldjglkajg"
    d = {}
    for i in str:
        if i not in d.keys():
            d[i] = 1
        else:
            d[i] += 1
    print(d)

望采纳！谢谢

dic=dict()
d={}
s=set()
s=input()
d=dict()
for x in s:
        if x not in d.keys():
                d[x]=1
else:
        d[x]=d[x]+1
print(d)