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#lang racket
(require "../../lib/utils.rkt")
(define fp (open-input-file "input"))
(define lines (get-lines fp))
(define (extract-number line)
(define number-list (filter char-numeric? (string->list line)))
(set! number-list (map (lambda (c)
(string->number (list->string (list c))))
number-list))
(+ (last number-list) (* 10 (car number-list))))
(apply + (map extract-number lines))
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