python:

身高,体重 = map(float,input().split())

身高**=2

值 = 体重/身高

if 值<18.5:

答 = '偏瘦

'if 值>=18.5 and 值<=23.9:

答 = '正常'

if 值>=24 and 值<=27.9:

答 = '偏胖'

if 值>=28 and 值<=39.9:

答 = '肥胖'

if 值 >= 40.0:

答 = '极重度肥胖'

print(答)