1. 问题描述

Check if the user's input is yes/y or no/n.

• If the input is yes or y, print Agree
• If the input is no or n, print Disagree
• Print Invalid input if the user input anything else
• Notice：
  • No matter how the user combines uppercases and lowercases, the program should treat them as valid input. (e.g. YeS or Yes are all valid inputs)
  • The spaces before and after user's input don't affect the result

2. Input & Output

Input:

• A string
• Use input() as input. Notice that the value you get from input() is a string

Output:

• A string
• Use print() for your output

Example

# Input: 
yes
# Output: 
同意

# Input: 
Nope
# Output: 
无效输入