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  1. g=lambda a,b,c,d:((a-b+c+d)/2,(a+b-c+d)/2,(a+b+c-d)/2,(d-a+b+c)/2)
  2. print(g(*map(float,input().split())))
Success #stdin #stdout 0.03s 9984KB
stdin
1 0 1 1
stdout
(1.5, 0.5, 0.5, 0.5)