diff --git a/cv3/program.c b/cv3/program.c
index 5a8464a..1159c93 100644
--- a/cv3/program.c
+++ b/cv3/program.c
@@ -95,7 +95,7 @@ int main() {
                 break;
             }
         } else {
-            //printf("Chyba: Neplatný vstup.\n");
+            printf("bad input\n");
             break;
         }
         for (int i = 0; i <= stack.size; i++) {