# [J], 19 bytes 1#.'1'=[":@}.i.@],] [Try it online!][TIO-kdk83yra] [J]: http://jsoftware.com/ [TIO-kdk83yra]: https://tio.run/##y/qvpKeepmBrpaCuoKNgoGAFxLp6Cs5BPm7/DZX11A3VbaOVrBxq9TL1HGJ1Yv9rcilwpSZn5CsoKBgqaFhbp2kqGBoYQIUMYUJGMCFDI2OokJm5xX8A "J – Try It Online"