Given a list of numbers, find the 3rd largest number.
[1,7,9,11,12,14,18,21]
The 3rd largest number in the given list is 14.
Complete the following task based on the instruction and optional input provided.### Instruction:
Given a list of numbers, find the 3rd largest number.

### Input:
[1,7,9,11,12,14,18,21]

### Output:
The 3rd largest number in the given list is 14.