def solution(s):
if "zero" in s:
s = s.replace("zero",'0')
if "one" in s:
s = s.replace("one",'1')
if "two" in s:
s = s.replace("two",'2')
if "three" in s:
s = s.replace("three",'3')
if "four" in s:
s = s.replace("four",'4')
if "five" in s:
s = s.replace("five",'5')
if "six" in s:
s = s.replace("six",'6')
if "seven" in s:
s = s.replace("seven",'7')
if "eight" in s:
s = s.replace("eight",'8')
if "nine" in s:
s = s.replace("nine",'9')
return int(s)
각각의 숫자를 replace로 구현해주면 끝난다.