Write a Python program that reads from standard input the amount of a restaurant bill and outputs two options for tipping, one based on 15% of the bill, the other based on 20% of the bill.
Problem 2: dealing with strings
Write a Python program that:
Reads a sentence from standard input
Writes this sentence on standard output all in lower case
Writes this sentence on standard output with all vowels in upper case and all consonants in lower case
Writes the sentence backwards
Problem 3: Counting words and characters
Write a Python program that:
Reads a sentence from standard input
Counts the number of words and the number of characters, not including space
For this problem, you will probably need the function len(): len(string) gives the length of string.
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