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, 3, ['2047', 'R', '6885', '1243', 'Z']
[EX A]: 5886

[EX Q]: 5, 7, ['N', 'U', 'L', '1205', '7327', 'b', 'c']
[EX A]: cb7237

[EX Q]: 4, 5, ['e', 'I', 'X', 'E', '8307', 'W', '4885']
[EX A]:
7038E