diff --git a/src/main/kotlin/ru/kotlin/homework/network/NetworkLogger.kt b/src/main/kotlin/ru/kotlin/homework/network/NetworkLogger.kt
index a5f33c5..3de20f1 100644
--- a/src/main/kotlin/ru/kotlin/homework/network/NetworkLogger.kt
+++ b/src/main/kotlin/ru/kotlin/homework/network/NetworkLogger.kt
@@ -10,14 +10,22 @@ 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> {
+class ErrorLogger<in E : Throwable> {
 
-    val errors = mutableListOf<Pair<LocalDateTime, E>>()
+    private val errors = mutableListOf<Pair<LocalDateTime, E>>()
 
     fun log(response: NetworkResponse<*, E>) {
         if (response is Failure) {
@@ -30,6 +38,9 @@ class ErrorLogger<E : Throwable> {
             println("Error at $date: ${error.message}")
         }
     }
+    fun dump(): List<Pair<LocalDateTime, *>> {
+        return errors.toList()
+    }
 }
 
 fun processThrowables(logger: ErrorLogger<Throwable>) {
@@ -40,6 +51,7 @@ fun processThrowables(logger: ErrorLogger<Throwable>) {
     logger.log(Failure(IllegalArgumentException("Something unexpected")))
 
     logger.dumpLog()
+    println(logger.dump().joinToString("\n"))
 }
 
 fun processApiErrors(apiExceptionLogger: ErrorLogger<ApiException>) {
@@ -50,6 +62,7 @@ fun processApiErrors(apiExceptionLogger: ErrorLogger<ApiException>) {
     apiExceptionLogger.log(Failure(ApiException.NetworkException))
 
     apiExceptionLogger.dumpLog()
+    println(apiExceptionLogger.dump().joinToString("\n"))
 }
 
 fun main() {
diff --git a/src/main/kotlin/ru/kotlin/homework/network/NetworkResponse.kt b/src/main/kotlin/ru/kotlin/homework/network/NetworkResponse.kt
index 3018c40..5dbcd26 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<out R>(val error: R): NetworkResponse<Nothing, R>()
 
 val s1 = Success("Message")
 val r11: NetworkResponse<String, Error> = s1