"You may assume that all inputs are consist of lowercase letters a-z. " is not true!

  • 0

    There is an uppercase "T" from the input data.
    My line 55 code access a 26 long array, corresponding to the 26 lowercase letters a-z.
    children[c - 'a'] != null
    And I have the error message below:

    Runtime Error Message:
    Line 55: java.lang.NullPointerException
    Last executed input:

    If all in puts consist of lowercase letters, how it comes with input data with uppercase letter?
    What's it for?

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