#if-elif-else문
'''
if 조건1:
    명령1
elif 조건2:
    명령2
elif 조건3:
    명령3
else:
    명령N
'''
score = 60

if score >= 90:
    print('A')
elif score >= 80:
    print('B')
elif score >= 70:
    print('C')
else:
    print('F')


print('----문제----')
age = 12
if age < 8:
    print('유치원생')
elif age < 14:
    print('초등학생')
elif age < 17:
    print('중학생')
elif age < 20:
    print('고등학생')
else:
    print('성인')


print('----숙제----')
month = 11

if 3 <= month < 6:
    print('봄')
elif 6 <= month < 9:
    print('여름')
elif 9 <= month < 12:
    print('가을')
else:
    print('겨울')