Get result from modulo operation in ios swift

Question

I want to achieve following result in iOS Swift 3 as per screenshot of googling. PFA below

I try in iOS Swift 3 but stuck when doing this, see the code

let resultAfterModulo: Int = (-3) % 24
print(resultAfterModulo)

output: -3

but output should be 21

Could anyone help me in this..?? Thanks in advance....