If you are given a sequence with out any label all you have

If you are given a sequence with out any label (all you have is a series of letters), how would you, as an undergraduate biology major, find out whether it is a DNA sequence or RNA sequence or a protein sequence? (Note: full credit will only be given for economical, feasible solutions)

Solution

If the given seequence contains ATGC in a sseries without U it reprsents DNA sequences and if it contains U instead of Tand , it represents RNA. And if the sequence has other alphabetical letters like MLCGVSADHPFIQRN then it represents protein sequence. these letterrs are amino acid sequences.