输入一组身高在170到190之间（5个身高），比较身高差，选出身高差最小的两个身高；若身高差相同，选平均身高高的那两个身高；从小到大输出；-Enter a height in between 170-190 (5 height), height difference compared to elect two smallest height difference, height　worse if the same height, the average height of a high pick those two tall　small to large output