You are given a space-separated list of numbers. Split the list into sublists with maximum length of 3.
1,2,3,4,5,6,7
[[1,2,3],[4,5,6],[7]]
Complete the following task based on the instruction and optional input provided.### Instruction:
You are given a space-separated list of numbers. Split the list into sublists with maximum length of 3.

### Input:
1,2,3,4,5,6,7

### Output:
[[1,2,3],[4,5,6],[7]]