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]: 8, 15, ['l', 'p', '7691', 'q', '5663', '41', 'P', '2779', '7265', 'V', '4931', '8979', 'l', 'l', 'l', '45', '1245', 'F', '1139', '3531', '5337', '369', 'g', 'Q']
[EX A]: lll97981394V56279772

[EX Q]: 1, 4, ['I', '5919', 'J', '6387']
[EX A]: 7836J9195I

[EX Q]: 5, 21, ['q', '903', 'D', '2237', '5307', '819', 'H', '4129', 'N', '3395', '5397', 'O', 'U', '8539', 'k', 'F', '9817', 't', 'Y', 'u', '5427', 'I', 'E', '6905']
[EX A]:
7245uYt7189Fk9358UO79355933N9214H9187035