Rewrite the sentence with the correct subject-verb agreement.
A flock of geese flying in the sky.
A flock of geese flies in the sky.
Complete the following task based on the instruction and optional input provided.### Instruction:
Rewrite the sentence with the correct subject-verb agreement.

### Input:
A flock of geese flying in the sky.

### Output:
A flock of geese flies in the sky.