Process the text through a parser to find the root of a sentence.
It was a beautiful day.
The root of the sentence "It was a beautiful day." is "was".
Complete the following task based on the instruction and optional input provided.### Instruction:
Process the text through a parser to find the root of a sentence.

### Input:
It was a beautiful day.

### Output:
The root of the sentence "It was a beautiful day." is "was".