Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the side-chain charge (ph 7.4) for the amino acid with the 1-letter p?

### Inputs:
table_name: table, columns: ['Amino Acid', '3-Letter', '1-Letter', 'Side-chain polarity', 'Side-chain charge (pH 7.4)', 'Hydropathy index']

### Response:
SELECT Side-chain charge (pH 7.4) FROM table WHERE 1-Letter = p