Alphabets in a string - python

A string S is passed as the input. S can contain alphabets, numbers and special characters. The program must print only the alphabets in S. 

Input Format: 

The first line contains S.

Output Format: 

The first line contains only the alphabets in S. 

Boundary Conditions:
The length of the input string is between 1 to 1000.

Example Input/Output 1:
Input:

abcd_5ef8!xyz 

Output:

abcdefxyz

Example Input/Output 2:

Input: 1239_-87 

Output:

Explanation: As there are no alphabets in the input value nothing is printed as output.

code:

n=input()

print(''.join(filter(str.isalpha,n)))