Given a DNA sequence, identify the start codon of the sequence.
ATGCCAAGAT
The start codon of the given DNA sequence is "ATG".
Complete the following task based on the instruction and optional input provided.### Instruction:
Given a DNA sequence, identify the start codon of the sequence.

### Input:
ATGCCAAGAT

### Output:
The start codon of the given DNA sequence is "ATG".