diff --git a/du3/program.c b/du3/program.c
index c6f253e..a40766f 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -72,6 +72,7 @@ int main() {
          print_stack(&s);
       }
    }
+   printf("no input");
 
    return 0;
 }