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]: 3, 8, ['b', 'y', '8779', '3949', 'c', 'a', '111', '6649']
[EX A]: 9466111ac94939778

[EX Q]: 2, 5, ['6345', '7381', 'm', '5685', '3267', '9841', '9719', 'N', 'e', '1455', 'i', '3989', '3285', '9257', 'u', '8547', '1799']
[EX A]: 76235865m1837

[EX Q]: 5, 6, ['X', '229', 'q', 'd', 'x', 'b', 'Z', 'K', 'l', '5975', 'r', 'M']
[EX A]:
bx