diff --git a/day2/条件循环.py b/day2/条件循环.py
index c587395..e216c9e 100644
--- a/day2/条件循环.py
+++ b/day2/条件循环.py
@@ -20,6 +20,12 @@ for i in a:
     b = i + b#从右边倒着加字符
 print(b)
 """
+# for i in 0,3 为什么i会输出1和3
+"""
+str = '123'
+print(str[3])为什么会超范围
+"""
+#此处开始
 str = input("")
 length = len(str)
 num = 0
@@ -28,8 +34,4 @@ for i in range(0, length):
     num = length - i - 1
     shot += str[num]
 print(shot)
-# for i in 0,3 为什么i会输出1和3
-"""
-str = '123'
-print(str[3])为什么会超范围
-"""
+