只要依次输出横坐标和纵坐标的最小值以及最大值就行

numsX, numsY = [], []
while True:
    try:
        x, y = map(int, input().split())
        if x == 0 and y == 0:
            print(min(numsX), min(numsY), max(numsX), max(numsY))
            numsX.clear()
            numsY.clear()
            continue
        numsX.append(x)
        numsY.append(y)
    except:
        break