def get_ordinal(n):

    my_dict = {1:'first', 2:'second', 3:'third', 4:'fourth', 5:'fifth',6:'sixth', 7:'seventh',8:'eighth',9:'ninth',10:'tenth', 11:'eleventh', 12:'twelfth' }

    if isinstance(n,int):
        if n in my_dict.keys():
            return my_dict.get(n)
    else:
        return ''

print(get_ordinal(1))