Apex domains cannot have CNAME records.
Question and response
Question
dig stroy-s-market.com. NS
Answer
stroy-s-market.com. 5 NS ns-1942.awsdns-50.co.uk.
stroy-s-market.com. 5 NS ns-316.awsdns-39.com.
stroy-s-market.com. 5 NS ns-1073.awsdns-06.org.
stroy-s-market.com. 5 NS ns-1581.awsdns-05.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0