def flip_the_number(number):
number = list(number)
print(number)
num = []
for i in range(len(number)):
lenth = len(number)
num.append(str(number[lenth-1-i]))
print(num)
join = ""
return join.join(num)
Test.assert_equals(flip_the_number("12345"), "54321");
Test.assert_equals(flip_the_number("1973572"), "2753791");