题解 | 进制转换

import sys

a = sys.stdin.readline().strip().split("x")[-1][::-1]
b = []
num = 0
dict = {"A":10, "B":11, "C":12, "D":13, "E":14, "F":15}
for i in a:
    c = i
    if i in dict.keys():
        c = dict[i]
    b.append(c)
for i in range(len(a)):
    num += int(b[i])*16**i
print(num)