input_text = None

with open("input.txt", "r") as f:
    input_text = f.read()

for (word, digit) in [("one",1), ("two",2), ("three",3), ("four",4), ("five",5), ("six",6), ("seven",7), ("eight",8), ("nine",9)]:
    input_text = input_text.replace(word, str(digit))