Output its second letter of the most frequent word from a sentence.
We can all make a difference.
The most frequent word in the sentence "We can all make a difference." is "a" and the second letter does not exist.
Complete the following task based on the instruction and optional input provided.### Instruction:
Output its second letter of the most frequent word from a sentence.

### Input:
We can all make a difference.

### Output:
The most frequent word in the sentence "We can all make a difference." is "a" and the second letter does not exist.