diff --git a/du3/program.c b/du3/program.c
index f9efcdb..3216d57 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -22,7 +22,7 @@ int is_full(struct stack *s){return s->size==STACK_SIZE-1;}
 
 void push(struct stack *s, float value){
     if (is_full(s)){
-        printf("Chyba");
+        printf("bad input\n");
         exit(1);
     }
     s->values[s->size++]=value;