diff --git a/cv3/program.c b/cv3/program.c
index 14b341c..5bc23c7 100644
--- a/cv3/program.c
+++ b/cv3/program.c
@@ -97,7 +97,9 @@ int main()
             print_stack(&mystack);
           }
       }  
-
+    else {
+        break;
+    }
     }while(1);
     if(!err)
         printf("no input\n");