Three Words

Three Words

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Let's teach the Robots to distinguish words and numbers.

You are given a string with words and numbers separated by whitespaces (one space). The words contain only letters. You should check if the string contains three words in succession. For example, the string "start 5 one two three 7 end" contains three words in succession.

example

Input: A string (str) with words.

Output: Logic value (bool).

Examples:

assert checkio("Hello World hello") == True
assert checkio("He is 123 man") == False
assert checkio("1 2 3 4") == False
assert checkio("bla bla bla bla") == True

How it is used: This teaches you how to work with strings and introduces some useful functions.

Precondition: The input contains words and/or numbers. There are no mixed words (letters and digits combined).
0 < len(words) < 100

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