Assume the sentence is speaking about the past. Signify that by adding appropriate punctuation:
Gibbons have short powerful arms and long hind legs
Gibbons had short, powerful arms and long hind legs.
Complete the following task based on the instruction and optional input provided.### Instruction:
Assume the sentence is speaking about the past. Signify that by adding appropriate punctuation:

### Input:
Gibbons have short powerful arms and long hind legs

### Output:
Gibbons had short, powerful arms and long hind legs.