diff --git a/du3/program.c b/du3/program.c
index 48cd434..037b096 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -16,8 +16,8 @@ struct stack {
 
 void push_stack(struct stack *s, float value) {
     if (s->size >= STACK_SIZE) {
-        printf("Chyba: zasobnik je plny.\n");
-        exit(1);
+        printf("full stack\n");
+        exit(0);
     }
     s->values[s->size] = value;
     s->size++;
@@ -25,8 +25,8 @@ void push_stack(struct stack *s, float value) {
 
 float pop_stack(struct stack *s) {
     if (s->size <= 0) {
-        printf("Chyba: zasobnik je prazdny.\n");
-        exit(1);
+        printf("empty stack\n");
+        exit(0);
     }
     s->size--;
     return s->values[s->size];