#31811: Python reduce解(超簡單)
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(St418)
from functools import reduce
print(abs(reduce(lambda x, y: int(y) - x, input(), 0)))
翻譯一下
diff = 0
for n in input():
diff = int(n) - diff
print(abs(diff))
例：1234
|1 - 2 + 3 - 4| = 2
可以理解成
|4 - (3 - (2 - 1)))| = 2
符合reduce的定義