Solve this logic number sequence puzzle by the correct digit
8080 = 6
1357 = 0
2022 = 1
1999 = 3
6666 = ?  Pick
A) four (4)	B) 2	C) 5	D) 7	E) 8
four (4)   4   No Of circles in the number.
<result>A</result>
Solve this logic number sequence puzzle by the correct digit
8080 = 6
1357 = 0
2022 = 1
1999 = 3
6666 = ?