Each char becomes n*chars where n is the index + 1, and the first char is capitalized divided by - instead of space.

Only alphabets are passed as arguments for the accum(s) function.

Example: accum("ZpglnRxqenU") should return "Z-Pp-Ggg-Llll-Nnnnn-Rrrrrr-Xxxxxxx-Qqqqqqqq-Eeeeeeeee-Nnnnnnnnnn-Uuuuuuuuuuu".

• accum("ZpglnRxqenU") returns "Z-Pp-Ggg-Llll-Nnnnn-Rrrrrr-Xxxxxxx-Qqqqqqqq-Eeeeeeeee-Nnnnnnnnnn-Uuuuuuuuuuu".
• accum("NyffsGeyylB") returns "N-Yy-Fff-Ffff-Sssss-Gggggg-Eeeeeee-Yyyyyyyy-Yyyyyyyyy-Llllllllll-Bbbbbbbbbbb".
• accum("MjtkuBovqrU") returns "M-Jj-Ttt-Kkkk-Uuuuu-Bbbbbb-Ooooooo-Vvvvvvvv-Qqqqqqqqq-Rrrrrrrrrr-Uuuuuuuuuuu".

function accum(s) {
  // your code goes below
}