Definition: In this task, you are given inputs i,j, and A, where i and j are integers and A is a list. You need to concatenate all elements of A from the ith element to the jth element, and print the resultant string. i and j will be non-negative, and will always have a value less than the length of A. i will always be less than j.
Input: 18, 19, ['7947', '3335', 'x', 'e', 'G', 'T', '2215', '7223', 'j', 'X', '2665', '2987', 'X', 'n', 'J', '3303', 'g', '779', '9637', 'T', 'r', 'P', 'm', 'q']

7799637