text: function insertDash(num) {
    let newArr=num.toString().split("");
    for(i=0; i<newArr.length; i++){
    if((newArr[i]%2==1) && (newArr[i+1]%2==1) ){
    newArr.splice(i+1, 0, "-");
    newArr.length++;
    }
    }
  
      return newArr.join('');
  }
  