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Letter Staircase

Here the string turns into a neat letter staircase: each next character is repeated one more time than the previous one. Write accum, which creates a group for each character in s: the first copy is uppercase, and the rest are lowercase. Join the groups with -.

Примеры

Ввод
"abcd"
Вывод
"A-Bb-Ccc-Dddd"
Ввод
"RqaEzty"
Вывод
"R-Qq-Aaa-Eeee-Zzzzz-Tttttt-Yyyyyyy"
Ввод
"cwAt"
Вывод
"C-Ww-Aaa-Tttt"

Нужно реализовать

def accum(s: str) -> str:

Теги

strings
PostgreSQLv16
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Aquí aparecerá el resultado de la ejecución del código

Visible tests
1
Input
"abcd"
Expected"A-Bb-Ccc-Dddd"
2
Input
"RqaEzty"
Expected"R-Qq-Aaa-Eeee-Zzzzz-Tttttt-Yyyyyyy"
3
Input
"cwAt"
Expected"C-Ww-Aaa-Tttt"
4
Input
"a"
Expected"A"
5
Input
"ZpglnRxqenU"
Expected"Z-Pp-Ggg-Llll-Nnnnn-Rrrrrr-Xxxxxxx-Qqqqqqqq-Eeeeeeeee-Nnnnnnnnnn-Uuuuuuuuuuu"
6
Input
"Hello, World!"
Expected"H-Ee-Lll-Llll-Ooooo-,,,,,,- -Wwwwwwww-Ooooooooo-Rrrrrrrrrr-Lllllllllll-Dddddddddddd-!!!!!!!!!!!!!"
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