Base36 https://en.wikipedia.org/wiki/Base36 https://www.wdic.org/w/SCI/36%e9%80%b2%e6%b3%95 ruby $ irb irb(main):001:0> 40.to_s(36) => "14" irb(main):002:0> 1248.to_s(36) => "yo" irb(main):003:0> 918237918.to_s(36) => "f6p0wu" irb(main):00…