Problem
Given a string, count and print the frequency of each lowercase letter that appears in it.
Input format
Input
input.txt
- A single line with a lowercase string (up to 100 characters)
Output format
Output
output.txt
- For each character that appears, print "char: count" on a new line, sorted alphabetically.
Example
input
banana
output
a: 3 b: 1 n: 2
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Sample cases (from the problem)
Sample Case 1
Input
banana
Expected output
a: 3 b: 1 n: 2
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