题解 | #进制转换#(最易于理解的方法之一)
进制转换
https://www.nowcoder.com/practice/8f3df50d2b9043208c5eed283d1d4da6
str1 = input()
str2 = str1[2:]
num1 = 0
num2 = len(str2) - 1
for i in str2:
if i == "a" or i == "A":
i = 10
elif i == "b" or i == "B":
i = 11
elif i == "c" or i == "C":
i = 12
elif i == "d" or i == "D":
i = 13
elif i == "e" or i == "E":
i = 14
elif i == "f" or i == "F":
i = 15
num1 += (16 ** num2) * int(i)
num2 -= 1
print(num1)
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