diff --git a/src/lesson8/task1/Files.kt b/src/lesson8/task1/Files.kt
index d7c454e43..6d4f2e9cf 100644
--- a/src/lesson8/task1/Files.kt
+++ b/src/lesson8/task1/Files.kt
@@ -54,7 +54,13 @@ fun alignFile(inputName: String, lineLength: Int, outputName: String) {
  *
  */
 fun countSubstrings(inputName: String, substrings: List<String>): Map<String, Int> {
-   TODO()
+    val text = File(inputName).readText().toLowerCase()
+    val substrs = mutableMapOf<String, Int>()
+    for (substring in substrings) {
+        val count = (text.length - text.replace(substring.toLowerCase(), "").length) / substring.length
+        substrs.put(substring, count)
+    }
+    return substrs
 }
 
 
@@ -64,6 +70,7 @@ fun countSubstrings(inputName: String, substrings: List<String>): Map<String, In
 
 
 
+
 /**
  * Средняя
  *
@@ -105,6 +112,7 @@ fun  centerFile(inputName: String, outputName: String) {
 
 
 
+
 /**
  * Сложная
  *