[Python] how custom sort of rows in polars

How to sort row with spesific order

df = pl.DataFrame({"currency": ["EUR","EUR","EUR","USD","USD","USD"], "alphabet": ["A","B","C","A","B","C"]})


i need to descending the currency and custom sort of alphabet

expected to be like this

shape: (6, 2)
┌──────────┬──────────┐
│ currency ┆ alphabet │
│ --- ┆ --- │
│ str ┆ str │
╞══════════╪══════════╡
│ USD ┆ C │
│ USD ┆ A │
│ USD ┆ B │
│ EUR ┆ C │
│ EUR ┆ A │
│ EUR ┆ B │
└──────────┴──────────┘

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