function longestConsec(strarr, k) {
  if (strarr.length === 0 || k> strarr.length || k <=0) return ""
  let result="";
//   const map = strarr.map((val,index)=>{
//     return strarr[index-1] + val
//   })
  const map = []
  let result2
  for(i=0;i < strarr.length;i++){
    result2 = ""
    for(j=0;j<k;j++){
      if (j==0){
        result2 = strarr[i]
      }else{
        if(strarr[i+j] != undefined){
//           console.log(strarr[i+k-1])
          result2 += strarr[i+j]
        }

      }
    }
    map.push(result2)
  }
  return checkLength(map)

}

function checkLength(maps){
  let maxLength,result
  maps.forEach((val,index)=>{
    if (index == 0){
      maxLength = val.length
      result = val
    }else if(maxLength < val.length){
      maxLength = val.length
      result = val
    }
  })
  return result
}