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2.20 Write an expression involving a three-letter string s that evaluates to a string whose characters are the characters of s in reverse order. If s is 'top', the expression should evaluate to 'pot'.

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MrRoyal

Answer:

The program in Python is as follows:

s = input("Three letter string: ")

if(len(s)==3):

    print(s[::-1])

else:

    print("Invalid length")

Explanation:

This prompts the user for a three-letter string

s = input("Three letter string: ")

The following if condition checks if the length of the string is 3. If yes, it reverses and print the reversed string

if(len(s)==3):

    print(s[::-1])

If otherwise, it prints "Invalid length"

else:

    print("Invalid length")

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