def mutation_detector(DNA1,DNA2):
    """recieves 2 DNA sequences and compare for mutations, return the first
    index in which a mutation has been detected and -1 if there are no mutations"""
    if sequence_check(DNA1)=="Wrong input" or sequence_check(DNA2)=="Wrong input":
        return "Wrong input"
    if len(DNA1)!=len(DNA2):
        return "Wrong input"
    for i in range(len(DNA1)):
        if DNA1[i]!=DNA2[i]:
            return i
    return -1