#35817: python答案
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(relxis)
while True:
try:
array = input().split(" ")
except:
break
if(len(array) == 4):
if((int(array[1]) + int(array[3]))/2 == int(array[2])):
emptystr = " "
print(f"{emptystr.join(array)} {int(array[2]) - int(array[1]) + int(array[3])}")
elif (int(array[1]) * int(array[3]) == int(array[2]) ** 2):
emptystr = " "
print(f"{emptystr.join(array)} {int(int(array[2]) / int(array[1]) * int(array[3]))}")