Rewrite this sentence so that its meaning is preserved but the words are rearranged.
She sang a sad song.
A sad song was sung by her.
Complete the following task based on the instruction and optional input provided.### Instruction:
Rewrite this sentence so that its meaning is preserved but the words are rearranged.

### Input:
She sang a sad song.

### Output:
A sad song was sung by her.