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]: 1, 6, ['7675', '2039', 'u', 'w', '8039', 'e', 'q']
[EX A]: e9308wu93025767

[EX Q]: 11, 12, ['z', 'y', 'R', '6287', '4197', '3293', '3153', 'K', '4947', '9051', 'w', '2343', '8697', '3145', '9297', 'Y', '5789', 'r', '4249', 'Y', 'Z', '5041']
[EX A]: 3432w

[EX Q]: 18, 21, ['M', '4603', 'u', '9119', 'e', '1023', '3079', '6723', 'e', 'w', '9493', '3079', 'c', 'b', 't', '5339', '2509', 'v', '3515', '6751', '2587', 'h', '5739', 'I', 'v', 'E', 'h', '1881']
[EX A]:
785215765153v