I've noticed that quite a few problems require reading in a binary string consisting of 0's and 1's. However, I haven't seen one problem where said string has only 6's and 7's.
Spoiler
6 7
I've noticed that quite a few problems require reading in a binary string consisting of 0's and 1's. However, I haven't seen one problem where said string has only 6's and 7's.