Exercise 3: The Most Frequent Letters

Discover the most frequently used letters in a text.

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Problem statement

Given text as a string, use the Counter class to find and report the three most frequent letters in that text as three space-separated characters. Treat the letters in a case-independent way.


Use the Counter class to print a list of the three most frequent letters in a human-readable way (separated by three spaces). Note that only letters should be counted, not other symbols!


For the text, "Mary had a little lamb", the program should report "a l m".

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