Assertion (A): Indexing in a string is defined as positive and negative indexing.

Reasoning (R): In forward and backward indexing, the indices start with 1^st index.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): The following code snippet on execution shall return the output as: False True

str1 "Mission 999"  
str2 = "999"  
print(str1.isdigit(), str2.isdigit())

Reasoning (R): isdigit() function checks for the presence of all the digits in an inputted string.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Explain function split() with an example.

How many times is the word 'HELLO' printed in the following statement?

s = "python rocks"
for ch in s:
    print ("Hello")