String index out of range - help please

[SheeppOSU]

For the formatting, I first made a function to find which toys' name has the most letters and how many that is. Then I recorded the largest for each. Finally, I went through the cost for each and printed it out. This could definitely be done more smoothly with the help of dictionaries and possibly more functions, which I would suggest to work on. Anyway, here's the code.

def LargestCharacterCount(WordList):
    count = 0
    for word in WordList:
        if len(str(word)) > count:
            count = len(str(word))
    return count

toys = ("Teddy Bear","Toy Train","Hoola Hoop","Betsy Wetsy","Pogo stick")
costs = (12.50,58.75,10.00,15.00,11.00)
markup = ()
for cost in costs:
    markup += (cost*.4, )

LargestToyCharacterAmount = LargestCharacterCount(toys)
LargestCostCharacterAmount = LargestCharacterCount(costs)
LargestMarkupCharacterAmount = LargestCharacterCount(markup)

count = 0
print("Item", " "*(LargestToyCharacterAmount-4), "Cost", " "*(LargestCostCharacterAmount-4), "Markup", " "*(LargestMarkupCharacterAmount-6), "Retail")
for toy in toys:
    print(toy, " "*(LargestToyCharacterAmount-len(toy)), costs[count], " "*(LargestCostCharacterAmount-len(str(costs[count]))), markup[count], " "*(LargestMarkupCharacterAmount-len(str(markup[count]))), costs[count]+markup[count])
    count += 1