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with open("teleport.in", "r") as fin:
l = list(fin)[0].split()
a,b,x,y = int(l[0]), int(l[1]), int(l[2]), int(l[3])
ans = min(abs(b-a), abs(x-a)+abs(b-y), abs(y-a)+abs(b-x))
with open("teleport.out", 'w') as fout:
fout.write(str(ans))
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