#### Frequency Finder

p
```# Frequency Finder

import string

# frequency taken from https://en.wikipedia.org/wiki/Letter_frequency
english_letter_freq = {
"E": 12.70,
"T": 9.06,
"A": 8.17,
"O": 7.51,
"I": 6.97,
"N": 6.75,
"S": 6.33,
"H": 6.09,
"R": 5.99,
"D": 4.25,
"L": 4.03,
"C": 2.78,
"U": 2.76,
"M": 2.41,
"W": 2.36,
"F": 2.23,
"G": 2.02,
"Y": 1.97,
"P": 1.93,
"B": 1.29,
"V": 0.98,
"K": 0.77,
"J": 0.15,
"X": 0.15,
"Q": 0.10,
"Z": 0.07,
}
ETAOIN = "ETAOINSHRDLCUMWFGYPBVKJXQZ"
LETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

def get_letter_count(message: str) -> dict[str, int]:
letter_count = {letter: 0 for letter in string.ascii_uppercase}
for letter in message.upper():
if letter in LETTERS:
letter_count[letter] += 1

return letter_count

def get_item_at_index_zero(x: tuple) -> str:
return x[0]

def get_frequency_order(message: str) -> str:
"""
Get the frequency order of the letters in the given string
>>> get_frequency_order('Hello World')
'LOWDRHEZQXJKVBPYGFMUCSNIAT'
>>> get_frequency_order('Hello@')
'LHOEZQXJKVBPYGFWMUCDRSNIAT'
>>> get_frequency_order('h')
'HZQXJKVBPYGFWMUCLDRSNIOATE'
"""
letter_to_freq = get_letter_count(message)
freq_to_letter: dict[int, list[str]] = {
freq: [] for letter, freq in letter_to_freq.items()
}
for letter in LETTERS:
freq_to_letter[letter_to_freq[letter]].append(letter)

freq_to_letter_str: dict[int, str] = {}

for freq in freq_to_letter:
freq_to_letter[freq].sort(key=ETAOIN.find, reverse=True)
freq_to_letter_str[freq] = "".join(freq_to_letter[freq])

freq_pairs = list(freq_to_letter_str.items())
freq_pairs.sort(key=get_item_at_index_zero, reverse=True)

freq_order: list[str] = [freq_pair[1] for freq_pair in freq_pairs]

return "".join(freq_order)

def english_freq_match_score(message: str) -> int:
"""
>>> english_freq_match_score('Hello World')
1
"""
freq_order = get_frequency_order(message)
match_score = 0
for common_letter in ETAOIN[:6]:
if common_letter in freq_order[:6]:
match_score += 1

for uncommon_letter in ETAOIN[-6:]:
if uncommon_letter in freq_order[-6:]:
match_score += 1

return match_score

if __name__ == "__main__":
import doctest

doctest.testmod()
```