Write the set of the letter of the word 'ALLAGABAD'. Also find the number of subsets of this set.

Explanation

To solve the problem, we will follow these steps:

### Step 1: Identify the unique letters in the word "ALLAGABAD"
The first step is to list the letters of the word "ALLAGABAD". The letters are: A, L, L, A, H, A, B, A, D.

### Step 2: Remove duplicates to form a set
A set contains only unique elements. So, we need to remove duplicates from our list of letters. The unique letters are:
- A
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