def main( a ):
if a < 0 :
print("입력한 값은 0보다 작습니다.")
elif a >= 0 and a < 10 :
print("입력한 값은 0이상 10미만입니다.")
elif 10 <= a and a < 20 :
print("입력한 값은 10이상 20미만입니다.")
else :
print("입력한 값은 20이상입니다.")
num = int(input("숫자를 입력해주세요:"))
main(num)
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