Create a function that takes a string and returns that string with the first half lowercased and the last half uppercased.
Example:
foobar => fooBAR
Winner: Joaquín Ferrero (joaquinferrero) - Perl - 40
Runner Up: Abhishek Chanda (achanda) - Python - 51
Return the first N items of the Fibonacci sequence.
The input will be a whole number greater than or equal to zero.
The output should be iterable.