Given two numbers and an arithmetic operator (the name of it, as a string), return the result of the two numbers having that operator used on them. a and b will both be positive integers, and a will always be the first number in the operation, and b always the second. The four operators are "add", "subtract", "divide", "multiply". A few examples:(Input1, Input2, Input3 --> Output) 5, 2, "add" --..