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J, 21 bytes ,&'+".1!:1(3)'1!:1(3) Try it online! STDIN is ugly in J because you have to use foreigns.
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#1: Initial revision
by
south
·
2022-02-14T07:36:53Z (over 2 years ago)
# [J](https://jsoftware.com/#/), 21 bytes ```J ,&'+".1!:1(3)'1!:1(3) ``` [Try it online!](https://tio.run/##y/r/PzU5I19BR01dW0nPUNHKUMNYUx1K//9vaGQMAA) STDIN is ugly in J because you have to use [foreigns](https://code.jsoftware.com/wiki/Vocabulary/Foreigns).