
function capitalize(str) {
	return str.charAt(0).toUpperCase() + str.slice(1)
}

function accum(s) {
  let stringArray = s.split("");
  let result = []
  let lenStr = stringArray.length
  let newLett = ''

  for(let i=0; i<lenStr; i++){
    for(let j=0; j<=i; j++){
      newLett += stringArray[i].toLowerCase()
    }
    result.push(newLett)
    newLett = ''
  }

  return result.map(capitalize).join("-");
}
//////////////////
accum("abcd")
accum("cwAt")
accum("RqaEzty")