Find Intersection

Have the function FindIntersection(strArr) read the array of strings stored in strArr which will contain 2 elements: the first element will represent a list of comma-separated numbers sorted in ascending order, the second element will represent a second list of comma-separated numbers (also sorted). Your goal is to return a comma-separated string containing the numbers that occur in elements of strArr in sorted order. If there is no intersection, return the string false.

Examples

Input: []string {"1, 3, 4, 7, 13", "1, 2, 4, 13, 15"}
Output: 1,4,13

Input: []string {"1, 3, 9, 10, 17, 18", "1, 4, 9, 10"}
Output: 1,9,10