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.

[EX Q]: 4, 20, ['p', '1643', 'O', '5867', 'Y', 'j', '2411', 'Z', '2563', '4757', 'B', 'b', '7489', '815', 'c', '6631', '8571', '6537', 'm', 'T']
[EX A]: Tm735617581366c5189847bB75743652Z1142jY7685

[EX Q]: 5, 24, ['7075', '6533', '1037', '3589', 'p', 'X', 'X', 'c', '5373', 'n', 'Q', '2281', '551', '3145', '541', '4495', 's', '5979', 'T', 't', '9121', 'O', '9105', 'V', '7855']
[EX A]: V5019O1219tT9795s594414554131551822Qn3735cXXp

[EX Q]: 1, 6, ['2097', 'b', '709', '3123', '3269', 'B', '1675', '5575', '3195', '7473', 'Z', '861', '8195', 'z', '2345', '977', '4549']
[EX A]:
B96233213907b7902