python - double input and extra letter in list in Sagemath -

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i'm newbie in python , sagemath, it's confusing me.

with following code, i've got u character before each element of list.

str = raw_input() chr = list(str) print chr  # input: "alma" # output: [u'a', u'l', u'm', u'a']

furthermore when run project input field appears twice. first when have write, , after when press enter (appears entered text)

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