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: 3, 11, ['M', '1269', '8573', 'S', 'f', 'B', '3667', '3561', 'i', 'A', '3687']

SOLUTION: 3687Ai35613667BfS8573

PROBLEM: 7, 7, ['o', '7695', 'M', 'C', '8035', '5877', '6703']

SOLUTION: 6703

PROBLEM: 19, 21, ['P', 'X', '1441', 'Q', '1083', '2623', '3883', 'H', '6997', '6115', '2401', 'm', '4783', 'w', '8231', '419', 'v', 'p', '6451', 'd', 'O', 'y', '5219', '9559']

SOLUTION:
Od6451