Categorize this sentence as one of these sentiments; anger, joy, sadness, disgust.
I am so proud of the work I did today.
The sentiment of the input sentence "I am so proud of the work I did today" is joy.
Complete the following task based on the instruction and optional input provided.### Instruction:
Categorize this sentence as one of these sentiments; anger, joy, sadness, disgust.

### Input:
I am so proud of the work I did today.

### Output:
The sentiment of the input sentence "I am so proud of the work I did today" is joy.