diff --git a/src/main/kotlin/ru/kotlin/homework/network/NetworkLogger.kt b/src/main/kotlin/ru/kotlin/homework/network/NetworkLogger.kt
index a5f33c5..d86eacf 100644
--- a/src/main/kotlin/ru/kotlin/homework/network/NetworkLogger.kt
+++ b/src/main/kotlin/ru/kotlin/homework/network/NetworkLogger.kt
@@ -2,6 +2,7 @@
 
 package ru.kotlin.homework.network
 
+import ru.kotlin.LoginException
 import ru.kotlin.homework.Circle
 import java.lang.IllegalArgumentException
 import java.time.LocalDateTime
@@ -10,29 +11,49 @@ import java.time.LocalDateTime
  * Известный вам список ошибок
  */
 sealed class ApiException(message: String) : Throwable(message) {
-    data object NotAuthorized : ApiException("Not authorized")
-    data object NetworkException : ApiException("Not connected")
-    data object UnknownException: ApiException("Unknown exception")
+    data object NotAuthorized : ApiException("Not authorized") {
+        private fun readResolve(): Any = NotAuthorized
+    }
+
+    data object NetworkException : ApiException("Not connected") {
+        private fun readResolve(): Any = NetworkException
+    }
+
+    data object UnknownException: ApiException("Unknown exception") {
+        private fun readResolve(): Any = UnknownException
+    }
 }
 
-class ErrorLogger<E : Throwable> {
+interface Logger<in E> {
+    fun log(response: NetworkResponse<*, E>)
+    fun dumpLog()
+}
+interface Dumper<out E> {
+    fun dump(): List<Pair<LocalDateTime, E>>
+}
+
+class ErrorLogger<E:Throwable> : Logger<E>, Dumper<E> {
 
-    val errors = mutableListOf<Pair<LocalDateTime, E>>()
+    private val errors = mutableListOf<Pair<LocalDateTime, E>>()
 
-    fun log(response: NetworkResponse<*, E>) {
+    override fun log(response: NetworkResponse<*, E>) {
         if (response is Failure) {
             errors.add(response.responseDateTime to response.error)
         }
     }
 
-    fun dumpLog() {
+    override fun dumpLog() {
         errors.forEach { (date, error) ->
             println("Error at $date: ${error.message}")
         }
     }
+
+    override fun dump(): List<Pair<LocalDateTime, E>> = errors
+
+
 }
 
-fun processThrowables(logger: ErrorLogger<Throwable>) {
+fun processThrowables(logger: Logger<Throwable>) {
     logger.log(Success("Success"))
     Thread.sleep(100)
     logger.log(Success(Circle))
@@ -42,7 +63,7 @@ fun processThrowables(logger: ErrorLogger<Throwable>) {
     logger.dumpLog()
 }
 
-fun processApiErrors(apiExceptionLogger: ErrorLogger<ApiException>) {
+fun processApiErrors(apiExceptionLogger: Logger<ApiException>) {
     apiExceptionLogger.log(Success("Success"))
     Thread.sleep(100)
     apiExceptionLogger.log(Success(Circle))
diff --git a/src/main/kotlin/ru/kotlin/homework/network/NetworkResponse.kt b/src/main/kotlin/ru/kotlin/homework/network/NetworkResponse.kt
index 3018c40..13d6aae 100644
--- a/src/main/kotlin/ru/kotlin/homework/network/NetworkResponse.kt
+++ b/src/main/kotlin/ru/kotlin/homework/network/NetworkResponse.kt
@@ -9,19 +9,19 @@ import java.time.LocalDateTime
 /**
  * Network result
  */
-sealed class NetworkResponse<T, R> {
+sealed class NetworkResponse<out T, out R> {
     val responseDateTime: LocalDateTime = LocalDateTime.now()
 }
 
 /**
  * Network success
  */
-data class Success<T, R>(val resp: T): NetworkResponse<T, R>()
+data class Success<out T>(val resp: T): NetworkResponse<T, Nothing>()
 
 /**
  * Network error
  */
-data class Failure<T, R>(val error: R): NetworkResponse<T, R>()
+data class Failure<R>(val error: R): NetworkResponse< Nothing,R>()
 
 val s1 = Success("Message")
 val r11: NetworkResponse<String, Error> = s1