#!/usr/bin/env python
# -*- coding: utf-8 -*-


"""
Napisz funkcję pokemon_speak, która zamienia w podanym napisie co drugą literę
na wielką. Np. pokemon_speak('pokemon') powinno zwrócić 'PoKeMoN'.
"""


def pokemon_speak(text):
    letterList = list(text)

    x = 0
    for i in letterList:
        if i.isalpha() and (x == 0 or x % 2 == 0):
            letterList[x] = i.upper()
        x += 1
    finalOutput = ''.join(letterList)
    return finalOutput




def tests(f):
    inputs = [ ['pokemon'], ['do not want'], ['POKEMON']]
    outputs = ['PoKeMoN', 'Do nOt wAnT', 'POKEMON']

    for input, output in zip(inputs, outputs):
        if f(*input) != output:
            return "ERROR: {}!={}".format(f(*input), output)
            break
    return "TESTS PASSED"

if __name__ == "__main__":
    print(tests(pokemon_speak))