codon_to_protein: dict[str, str] = {
    "AUG": "Methionine",
    "UUU": "Phenylalanine",
    "UUC": "Phenylalanine",
    "UUA": "Leucine",
    "UUG": "Leucine",
    "UCU": "Serine",
    "UCC": "Serine",
    "UCA": "Serine",
    "UCG": "Serine",
    "UAU": "Tyrosine",
    "UAC": "Tyrosine",
    "UGU": "Cysteine",
    "UGC": "Cysteine",
    "UGG": "Tryptophan",
}

stop_codons: list[str] = ["UAA", "UAG", "UGA"]


def proteins(strand):
    protein: list[str] = []
    codon: str = ""
    for nucleotide in strand:
        codon += nucleotide
        if len(codon) == 3:
            if codon in stop_codons:
                break
            protein.append(codon_to_protein[codon])
            codon = ""
    return protein