diff --git a/cv1/program.c b/cv1/program.c
index 8d2936c..e8b1973 100644
--- a/cv1/program.c
+++ b/cv1/program.c
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <ctype.h>
 
 int main() {
     char ch;
@@ -7,9 +8,13 @@ int main() {
     while ((ch = getchar()) != EOF) {
         if (ch == '\n') {
             line_count++;
-            putchar('\n');
         } else {
-            putchar((ch >= 'a' && ch <= 'z') ? (ch - 32) : ((ch >= 'A' && ch <= 'Z') ? (ch + 32) : ch));
+            if (isprint(ch)) {
+                putchar((ch >= 'a' && ch <= 'z') ? (ch - 32) : ((ch >= 'A' && ch <= 'Z') ? (ch + 32) : ch));
+            }
+            else {
+                putchar(ch);
+            }
         }
     }