Only first letter in the cell of the file.

[rturus]

            b=b+1
            for a in range(0,b):
                writefile = open("data.csv",'a')
                writefile.write(str(name[a]) + "," + str(surname[a]) + "," + "\n")
            
            writefile.close() 

When I enter name and surname I only see the first letter on my file called data. Any idea why this is the case?

Thanks.