单选题

运行下列程序,输出的结果是? (    )

def fun(a, b):

    s=0

    a = a[::-1]

    for i in range(len(a)):

        s += int(a[i])*b**i

    return s

print(fun('45',16))

A

69

B

45

C

64

D

61

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