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Forwards and backwards

The code below will traverse over a string going forwards. Without using a second loop, can you get it to display the letters of the word both forwards and backwards at the same time. For example –

input – tiger
tr
ie
gg
ei
rt

word = input("Enter a word")
pos = 0
while pos < len(word):
	print(word[pos])
	pos = pos + 1


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