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, ['B', '7943', 'H', 'E', 'p', 'D', 'L', '625', '2757', '4429', '863', 'z', 'l', 'f', '3467', 'X', '4961', 'T', 'k', '1021', 'T', '2249', 'S', 'D']

SOLUTION: LDp

PROBLEM: 10, 13, ['K', '6565', 'A', '5073', '1249', '2817', '3663', '3799', 'G', '2707', '3405', '5999', '5577', 'c', 'p', 'V', '8373', 'e', 'W', '5977', 's', 'p', 'E', '5425']

SOLUTION: 7755999550437072

PROBLEM: 5, 26, ['4115', '19', '6885', 'g', '4807', 'Z', 'F', 'f', 'K', '9703', 'T', '5197', 'K', '4887', 'U', 'L', 'O', 'L', 'q', 'D', 'F', '7385', 'O', '9623', 'Z', '841', '3495', '8879']

SOLUTION:
148Z3269O5837FDqLOLU7884K7915T3079KfFZ7084