1. Description

Code a function which takes an integer as input and check if this integer is a "lucky number"

The definition of a lucky number is as follows:

• Add all digits of this number together
• If the result is 1, the number is a lucky number
• Otherwise, repeat the same process with the result until a single-digit number is obtained

For example,

2. Input & Output

Input:

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

Output:

• A boolean True/False
• Use print() for your output

Example

# Input: 
100
# Output: 
True

# Input: 
299
# Output: 
False