Update Day_11.md

Author: darkprinx

Status/Day_11.md

@@ -56,7 +56,8 @@ print(lst2)
 ### Hints: Use "for" to iterate the tuple. Use tuple() to generate a tuple from a list.
 
 -------------------
-**My Solution: Python 3**
+
+**Main Author's Solution: Python 2**
 ```
 tp = (1,2,3,4,5,6,7,8,9,10)
 li = list()
@@ -82,3 +83,33 @@ tpl1 = tuple(filter(lambda x : x%2==0,tpl)) # Lambda function returns True if f
 print(tpl1)
 ```
 ----------------
+
+# Question 40
+### Level 1
+
+**Question:**
+
+***Write a program which accepts a string as input to print "Yes" if the string is "yes" or "YES" or "Yes", otherwise print "No". ***
+
+----------------------
+### Hints: Use if statement to judge condition.
+
+-------------------
+**Main Author's Solution: Python 2**
+```
+s= raw_input()
+if s=="yes" or s=="YES" or s=="Yes":
+ print "Yes"
+else:
+ print "No"
+```
+----------------
+**My Solution: Python 3**
+```
+s = input()
+if s.lower() == 'yes': # lower function returns all lowercase letters in the string
+ print('Yes')
+else:
+ print("No")
+```
+----------------