According to Data Science Topic-11 one program for Operators

 number = int(input("Enter a number: "))

print(number)

# 345%10 -> 5

a = number%10

# 345%10 -> 34


number = number//10


# 34%10 -> 4

b = number % 10


number = number//10

# 3 % 10 -> 3

c = number % 10

print(a+b+c)

Result:  Enter a number: 345

345

12

Enter a number: 666

666

18

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