A text file contains alphanumeric text. Write a program that reads this text file and prints only the numbers

Q. A text file contains alphanumeric text (say an.txt). Write a program that reads this text file and prints only the numbers or digits from the file.

Answer =

F = open("an.txt", "r")
for line in F :
  words = line.split()
  for i in words :
    for letter in i :
      if(letter. isdigit()) :
        print(letter)