Python Programming Basics - Assignment

Problem Statement:

Write a program that accepts a sentence and calculate the number of letters and digits.

1. Define function 'letterAndDigit' which will accept a string as argument.
2. String should not be empty or none.
3. Calculate number of digits and characters inside string and return a dict object in format of {"DIGITS":count, "LETTERS":count}.
4. Function should pass all test cases.