diff --git a/cv1/program.c b/cv1/program.c
index 930017d..79b4f8d 100644
--- a/cv1/program.c
+++ b/cv1/program.c
@@ -1,22 +1,21 @@
 #include <stdio.h>
-#include <ctype.h> 
 
 int main() {
-    char ch;
+    int ch;
     int line_count = 0;
     while ((ch = getchar()) != EOF) {
         if (ch == '\n') {
             putchar('\n');
             line_count++;
         } else {
-            if (isprint(ch)) {
-                putchar((ch >= 'a' && ch <= 'z') ? (ch - 32) : ((ch >= 'A' && ch <= 'Z') ? (ch + 32) : ch));
-            }
-            else {
-                putchar(ch);
+            if (!((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z')) && !(ch >= 32 && ch <= 126)) {
+                continue; // Skip control characters and non-printable characters
             }
+            putchar((ch >= 'a' && ch <= 'z') ? (ch - 32) : (ch + 32));
         }
     }
+    
     printf("\nLines count: %d\n", line_count);
+
     return 0;
 }
\ No newline at end of file