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    \$\begingroup\$ Nice one! You can have a test suite if you use the current string rather than the original input from the history ($0 instead of $+) Try it online! \$\endgroup\$ Commented Feb 20, 2024 at 3:36
  • \$\begingroup\$ @Leo Ah yes, normally I have to delete the input number before the loop, but I was able to get away without that here. \$\endgroup\$ Commented Feb 20, 2024 at 9:05