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]: 5, 12, ['t', '4541', 'z', 'K', 'b', 'E', '3395', 'z', '4511', 'F', '7085', '3753', 'n', 'W', 'J']
[EX A]: 35735807F1154z5933Eb

[EX Q]: 1, 8, ['7991', '7999', '8575', '4211', '6003', '2483', '7877', '7249', 'K', '21']
[EX A]: 94277787384230061124575899971997

[EX Q]: 1, 23, ['O', '8109', 'j', 'e', '5439', '6827', '505', '2969', 'T', '103', 'd', '6765', '1671', 'T', 'Q', '143', 'Q', 'O', '7239', '7231', '4993', '8239', '6491', 'a', '5159', 'm', '5237']
[EX A]:
19469328399413279327OQ341QT17615676d301T969250572869345ej9018O