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]: 2, 10, ['R', 'g', '8909', '6051', '4011', 'T', 'P', '5051', 'u', '6287', '1069', '9051', 'K', 'G', 'o', 'b', '87', 'I', '6941', 'p', '6797', '8081', '6393', '4847', 'q', '8609', '739', 'P', '8443', 'C']
[EX A]: 7826u1505PT110415069098g

[EX Q]: 2, 11, ['N', '5989', '9485', '1955', '4841', '8403', 'f', 'M', '3261', '9581', '8083', '5201', '6391', 'h', 'C', 'O', '6361', '4033', '9121', '9825']
[EX A]: 380818591623Mf30481484559158499895

[EX Q]: 21, 23, ['N', '4339', '6863', '41', 'y', '3467', '6203', 'U', 'q', '9543', '3947', 'X', 'Y', 'k', '4949', 'L', '2321', '5527', 'd', 'J', '4543', '7673', 'm', '9343', 'k', '1685', 'S', 'x', 'c', '67']
[EX A]:
m37673454