diff --git a/du3/program.c b/du3/program.c
index 1f8eb57..3e926f0 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -47,7 +47,7 @@ int main(void) {
             ulozisko[top++] = vysledok;
         } 
         else {
-            printf("invalid input\n");
+            printf("bad input\n");
             return 0;
         }