-keepclassmembers class * implements com.yandex.mobile.ads.banner.BannerAdEventListener {
    !private <methods>;
}

-keepclassmembers class * implements com.yandex.mobile.ads.interstitial.InterstitialAdEventListener {
    !private <methods>;
}

-keepclassmembers class * implements com.yandex.mobile.ads.rewarded.RewardedAdEventListener {
    !private <methods>;
}