Project: Variables 'a', 'b', 'c', 'd' have been initialized to unknown values. Your task is to initialize the value of 'sum' to be the higher value between (a + b) and (c + d).
Example:
a = 5
b = 6
c = 4
d = 9
sum = 13
Note: If your code works for 5 test cases in a row, you can enter your e-mail address.