#24 - Count Letter Frequency

You are given a string. Your task is to implement a function that counts the frequency of each letter in the string.

• Ignore case sensitivity. Consider 'A' and 'a' as the same letter.

• Ignore non-alphabetic characters

Example 1

Input

"tomato"

Output

t = 2
o = 2
m = 1
a = 1

Example 2

Input

"hello world"

Output

h = 1
e = 1
l = 3
o = 2
w = 1
r = 1
d = 1