Write a method with two integer input parameters. As preconditions, you can assume that both integers are non-negative. Return the sum of the digits in the ones place in these numbers. For example, if the two integers are 562 and 11128, you would return 10 since the one's places are 2 and 8 and the sum of those is 2+8=10. However, if the sum of the digits in the one's place is 13, return -99 instead.