RNA

using System;

public static class RnaTranscription
{
public static string ToRna(string nucleotide)
{
string complete = "";
if (nucleotide == "")
{
return "";
}

    else 
        {  
         for(int i=0; i<nucleotide.Length; i++)
            {
             if(nucleotide[i] == 'G')
                    {
                        complete += "C";
                    }
                    else if(nucleotide[i] == 'C')
                    {
                        complete += "G";
                    }
                   else if(nucleotide[i] == 'T')
                    {
                        complete += "A";
                    }
                  else if (nucleotide[i] == 'A')
                       {complete += "U";}
                     
            }
 return complete;
    } 
}

}