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: 3, 6, ['643', 'X', 'F', '7453', '8495', '7943']

SOLUTION: 349759483547F

PROBLEM: 16, 17, ['E', '3657', 'O', 'B', 'V', '3761', 'v', '563', '1623', 'J', '5961', 'h', '5241', '9983', '3325', '1513', 'R']

SOLUTION: R3151

PROBLEM: 9, 15, ['6847', 'U', '8825', '9155', '2623', 'C', '1953', 'k', '4901', '7685', 'G', 'r', 'A', '5675', 'S', '6247', 'Y', 'D']

SOLUTION:
S5765ArG58671094