import string


def to_rna(dna_string):
    table = string.maketrans("GCTA", "CGAU")
    return dna_string.translate(table)

00e20912b7a469fcb91c24d88c389a8b04ecdf4b
<mask token>

<mask token>


def to_rna(dna_string):
    table = string.maketrans('GCTA', 'CGAU')
    return dna_string.translate(table)

import string


def to_rna(dna_string):
    table = string.maketrans('GCTA', 'CGAU')
    return dna_string.translate(table)

import string


def to_rna(dna_string):
    table = string.maketrans("GCTA", "CGAU")
    return dna_string.translate(table)
