Write the function lettersOnly (s) that takes in a string called s, and returns a string containing only the alphabetic characters of s.

The program to this question as follows:

Program:

def lettersOnly (s) : #defining method lettersOnly

val="" #defining string variable that return value

for i in s: #defining loop to calculate value

if (i. isalpha ()) : #check condition that value is string

val=val + i #add value

return val #return value

print (lettersOnly ("data3base_ro1c3k5s")) #call method and print value

Output:

databaserocks

Explanation:

In the above python code, a method lettersOnly is declared that accepts a string variable "s" in its parameter. Inside the method, a string variable "val", and loop is declared, in which the "val" variable holds method return value.

In the loop and if block is used that uses "isalpha" string method, which checks the check alphabetic character in the given value. if this is true it will calculate all value in "val" variable and return its value. At the last, the print method is used, which calls the lettersOnly method and prints its return value.