Case-Insensitive Character Frequency Counting

Given a non-empty string consisting exclusively of alphabet characters (both uppercase and lowercase), compute the frequency of each character in a case-insensitive manner. That is, characters such as A and a are considered the same.

The output should be a dictionary literal formatted as follows:

[ { 'a': f_a, 'b': f_b, \dots } ]

where each key is a lowercase letter and f_x is the frequency of that letter in the input string. The dictionary items must be listed in ascending alphabetical order by the character.

Example:

• Input: aAbBcC
• Output: {'a': 2, 'b': 2, 'c': 2}

inputFormat

The input consists of a single line containing a non-empty string of alphabet characters. No spaces or other characters are present.

outputFormat

Output the character frequencies in the form of a Python dictionary literal. Each key must be a lowercase letter enclosed in single quotes, and the keys must appear in ascending alphabetical order. There should be no extra spaces except for a single space after each colon and comma as shown in the sample output.

aAbBcC

{'a': 2, 'b': 2, 'c': 2}