How to transfer a couple of apps from a Lenovo A858 into an Apple iphone 5S?

How to transfer a couple of apps from a Lenovo A858 into an Apple iphone 5S?

Easy. You can't, at least not as a direct transfer as you can't run an Android app on anything other than a device using the Android OS.

But you can look on the Apple App Store on your iPhone to see whether the apps you want are also available for iOS. If so, download and install them on your iPhone but bear in mind that they might not look or work in exactly the same way as you have been used to. If they're not available then search for similar apps and use those instead.

You don't. They run different OSs.