Below is an instruction that describes a task. Write a response that appropriately completes the request in Chinese. Please answer in Chinese.

### Instruction:
 一支钢笔比橡皮长3厘米，比铅笔短2厘米。考虑到铅笔长12厘米，橡皮、钢笔和铅笔的总长度是多少？


### Response:
 橡皮比钢笔短3厘米。
铅笔比钢笔长2厘米。
橡皮、钢笔和铅笔的总长度是12 + 3 + 2 = <<12+3+2=17>>17厘米。