TASK DEFINITION: In this task, you are given inputs 'i', 'j', and A, where 'i' and 'j' are integers and A is a list. A list is shown by two brackets and comma-separated numbers and characters inside, like ['1', '12', 'l']. You need to concatenate all elements of A from the ith element to the jth element, and then reverse the resulting 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 reverse first and then concatenate.
PROBLEM: 5, 7, ['N', 'U', 'L', '1205', '7327', 'b', 'c']

SOLUTION: cb7237

PROBLEM: 3, 15, ['O', 'a', '6377', 'R', '1363', '8013', '1923', '4039', 'j', '1365', 'E', 'P', '7225', '7813', 'I']

SOLUTION: I31875227PE5631j9304329131083631R7736

PROBLEM: 2, 14, ['5803', 'C', '5073', '2089', '5743', 'P', 'L', '1665', '1767', '9169', 'Z', '7175', 'X', 'w', 'g']

SOLUTION:
wX5717Z961976715661LP347598023705C