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: 2, 3, ['5191', '9077', 'a']

SOLUTION: a7709

PROBLEM: 2, 18, ['8671', 'd', '5109', '1915', 'h', '2777', '3087', '9861', '8597', 'P', '4505', 'j', 'M', 'O', 's', 'Q', '2703', 'X', 'l', 'g', '1801']

SOLUTION: X3072QsOMj5054P7958168978037772h51919015d

PROBLEM: 10, 11, ['q', '6245', 'O', '5361', '8343', 'D', 'X', '6285', 'F', 'q', '4911', '9613', 'z', '159', 'Y', '1341']

SOLUTION:
1194q

