Write a function that takes in 2 numbers, return a function that takes in a number that returns the sum of all 3 numbers when called. Example:

const a = solution(1,2); // a is a function
// a(1) returns 4 because 1+2+1
// a(5) returns 8 because 1 + 2 + 5 
// a(2) returns 5 because 1 + 2 + 2