shift from jQuery on js

Question

I need to replace the code jquery on js
https://code.sololearn.com/WMfi36D15dEm/?ref=app

Answer 1

f.innerHTML+="</br>"
break;
case 1:
f.innerHTML+="@"
break;
case 2:
f.innerHTML+="#"
break;
case 3:
f.innerHTML+="*"
break;
case 4:
f.innerHTML+="+"
break;
case 5:
f.innerHTML+="-"
break;
case 6:
f.innerHTML+="quot;
break;

Answer 2

thanks worked