# 1번
n = int(input())
if n % 2 == 0:
    print("짝수입니다.")
else:
    print("홀수입니다.")

# 2번
score = int(input())
if score >= 90:
    print('A')
elif score >= 80:
    print('B')
elif score >= 70:
    print('C')
else:
    print('F')
    

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