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: 1, 3, ['8015', 'y', 'r', '8077', 'U']

SOLUTION: ry5108

PROBLEM: 2, 12, ['p', 'o', '2673', 'd', 'r', 'n', 'Z', 'u', 'm', '5195', '6521', '7671']

SOLUTION: 176712565915muZnrd3762o

PROBLEM: 8, 15, ['K', 'v', '6355', '3507', 'u', '8219', '3269', '7577', 'Q', 'R', '3715', 'F', '3643', 'g', 'Z', '8715', '1271', '6081', '8379', 'R', 'f', '469', 'W', '383', '9003', 'P', 'y', '2771']

SOLUTION:
Zg3463F5173RQ7757