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added 125 characters in body

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edited Jun 28, 2017 at 19:01

Bash + coreutils, 3030 28 bytes

grepfold -o .|sort|uniq1|sort|uniq -u|tail -1

sort|uniq -u|tail -1

If input is given as a list of digits, one per line, we can skip the grepfold stage. That feels like cheating though.

grep -o .|sort|uniq -u|tail -1

sort|uniq -u|tail -1

If input is given as a list of digits, one per line, we can skip the grep stage. That feels like cheating though.

-2 bytes thanks to Digital Trauma

fold -1|sort|uniq -u|tail -1

sort|uniq -u|tail -1

If input is given as a list of digits, one per line, we can skip the fold stage. That feels like cheating though.

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created Jun 28, 2017 at 13:31

grep -o .|sort|uniq -u|tail -1

sort|uniq -u|tail -1

If input is given as a list of digits, one per line, we can skip the grep stage. That feels like cheating though.