# https://school.programmers.co.kr/learn/courses/30/lessons/120834
# programmers, level0: 외계행성의 나이, python3
def solution(age: int) -> str:
dict = {index: chr(x) for index, x in enumerate(range(97, 97+10))}
return ''.join(map(str, [dict[int(x)] for x in list(str(age))]))
if __name__ == '__main__':
print(solution(23)) # "cd"
print(solution(51)) # "fb"
print(solution(100)) # "baa"