[python] Find the item with maximum occurrences in a list

Following is the solution which I came up with if there are multiple characters in the string all having the highest frequency.

mystr = input("enter string: ")
#define dictionary to store characters and their frequencies
mydict = {}
#get the unique characters
unique_chars = sorted(set(mystr),key = mystr.index)
#store the characters and their respective frequencies in the dictionary
for c in unique_chars:
    ctr = 0
    for d in mystr:
        if d != " " and d == c:
            ctr = ctr + 1
    mydict[c] = ctr
print(mydict)
#store the maximum frequency
max_freq = max(mydict.values())
print("the highest frequency of occurence: ",max_freq)
#print all characters with highest frequency
print("the characters are:")
for k,v in mydict.items():
    if v == max_freq:
        print(k)

Input: "hello people"

Output:

{'o': 2, 'p': 2, 'h': 1, ' ': 0, 'e': 3, 'l': 3}

the highest frequency of occurence: 3

the characters are:

e

l

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