diff --git a/chapters/chapter-1-fundamentals/1.3-bags-queues-ans-stacks/evaluate.js b/chapters/chapter-1-fundamentals/1.3-bags-queues-ans-stacks/evaluate.js
index 675b8c3..9e97471 100644
--- a/chapters/chapter-1-fundamentals/1.3-bags-queues-ans-stacks/evaluate.js
+++ b/chapters/chapter-1-fundamentals/1.3-bags-queues-ans-stacks/evaluate.js
@@ -1,6 +1,6 @@
 console.log('evaluate:')
 /* input start */
-var input = '( 1 + ( ( 2 + 3 ) * ( 4 + 5 ) )';
+var input = '( 1 + ( ( 2 + 3 ) * ( 4 + 5 ) ) )';
 input = input.replace(/\s/g, '').split('');
 /* input end */
 console.log('> input: ' + input.join(' '));