Hi,
Here's the [https://download.lenovo.com/consumer/mobiles_pub/ideapad110s-11ibr_hmm_201610.pdf|hardware maintenance manual] for the laptop.
Go to p.45 to view the ''necessary pre-requisite steps'' and then the procedure to remove the ''upper case assembly''. The keyboard is part of the assembly.
On p.58 Item #2 you will find the part numbers for all the ''country and colour specific'' keyboards available for the model.
Search online using the ''part number only'' applicable to your particular model variant i.e. country and colour (BK=black, WH=whlte) to find suppliers that suit you best. Usually the part number can be found on the underside of the uppercase assembly if you wish to verify that you're ordering the correct one