TASK 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 find all elements of A from the ith element to the jth element, reverse the order in which they occur, and then concatenate them to output 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. Perform the operations in order, i.e., do not concatenate the elements and then reverse the string.
PROBLEM: 25, 26, ['1029', 't', 'H', '47', 'f', '1269', '4723', '9575', '6769', 'u', '6641', 'I', 'H', 'A', '2729', 'l', 'b', '9215', '8167', '221', '3519', 'P', 'm', 'G', '8053', '6319', 'M', '2549', 'i']

SOLUTION: 63198053

PROBLEM: 1, 1, ['U', 'R']

SOLUTION: U

PROBLEM: 3, 4, ['D', 'k', 'Q', '3207']

SOLUTION:
3207Q