diff --git a/a1/program.c b/a1/program.c
index dd44bc2..37ae394 100644
--- a/a1/program.c
+++ b/a1/program.c
@@ -12,10 +12,10 @@ int main(void) {
             putchar(c - 'a' + 'A');
         } else if (c >= 'A' && c <= 'Z') {
             putchar(c - 'A' + 'a');
-        } else {
-            
+        } else if (c >= 32 && c <= 126) {  
             putchar(c);
         }
+        
     }
 
     printf("\nLines count: %d\n", riadky);