diff --git a/du3/program.c b/du3/program.c
index 880fbc8..a7586b0 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -22,8 +22,8 @@ int is_full(struct stack *s){return s->size==STACK_SIZE-1;}
 
 void push(struct stack *s, float value){
     if (is_full(s)){
-        printf("bad input\n");
-        exit(1);
+        printf("full stack\n");
+        exit(0);
     }
     s->values[s->size++]=value;
 }