Looking for Letters

Challenge
Use the programming interface to complete this task.

Input: A string containing alphanumeric characters.
Output: A string containing only the letters of the input.

Read the input from a file called looking-for-letters.in that’s in the current working directory, and then write your output to a file called looking-for-letters.out.

Solution

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inputstring= open("looking-for-letters.in").readline().rstrip('\n')

result = ''.join([i for i in inputstring if not i.isdigit()])

open("looking-for-letters.out",'w').write(result+'\n')

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