x = "Abe!!4"
count = {}

for s in x.lower():
    if s == ' ' or s.isdigit() or s in '!@#$%^&*()></?:"':
        continue
    elif s in count.keys():
        count[s] += 1
    else:
        count[s] = 1

This is the result I get.

count = {'a': 1, 'e': 1, 'b': 1}

I want to append the keys with identical values/and or the max value into a list so I can sort them an return the first index. It should be easy but I can't find anything on the internet to help. I'm sure it's simple. Help me! what am I missing!?