Thanks very much!
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I think the issue is that `read-line` is returning a string, so in every
iteration of the for loop line is bound to a single character from that
string, I think you may want to use `in-lines`[1] instead of `read-line`.
[1]:
http://docs.racket-lang.org/reference/sequences.html?q=in-lines#%28def._%2
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