while True:
    height = int(input('신장: ')) * 0.01
    weight = int(input('몸무게: '))
    bmi = weight / (height * height)

    if bmi < 18.5:
        print('저체중이시네요?')
    elif 18.5 <= bmi <= 22.9:
        print('정상이시네요?')
    elif 23 <= bmi <= 24.9:
        print('비만 전 단계시네요?')
    elif 25 <= bmi <= 29.9:
        print('1단계 비만이시네요?')
    elif 30 <= bmi <= 34.9:
        print('2단계 비만이시네요?')
    else:
        print('3단계 비만이시네요?')

    print("다시 하시겠습니까?")
    reply = input()

    if reply == "yes":
        continue
    else:
        break