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

### Instruction:
A pen is longer than the rubber by 3 centimeters, and shorter than the pencil by 2 centimeters. Considering the pencil is 12 centimeters long, what is the total length of the rubber, the pen, and the pencil altogether?

### Response:
 Kalamu ina urefu wa 12 - 2 = <<12-2=10>>10 sentimita.
Mswaki ni mfupi kuliko kalamu kwa sentimita 3, hivyo ina urefu wa 10 - 3 = <<10-3=7>>7 sentimita.
Urefu jumla ni 7 + 10 + 12 = <<7+10+12=29>>29 sentimita.