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, ['6875', 'D', 'r']

SOLUTION: rD

PROBLEM: 11, 12, ['z', 'y', 'R', '6287', '4197', '3293', '3153', 'K', '4947', '9051', 'w', '2343', '8697', '3145', '9297', 'Y', '5789', 'r', '4249', 'Y', 'Z', '5041']

SOLUTION: 3432w

PROBLEM: 5, 11, ['f', '3523', 'b', '5137', 'm', 'f', '1445', '3589', 'f', 'j', '2491', 'H']

SOLUTION:
1942jf98535441fm