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, 4, ['6193', '5871', '9871', '4821']
[EX A]: 1284178917853916

[EX Q]: 3, 22, ['5347', 'e', 'a', 'i', 'o', 'W', '3101', '5381', 'u', '8799', 'r', '7559', '9931', 'V', 'l', 'v', 's', 'q', 'C', 'o', '7803', 'c']
[EX A]: c3087oCqsvlV13999557r9978u18351013Woia

[EX Q]: 11, 15, ['s', '1601', '1221', '9269', 'W', '1691', 'M', 's', 'a', '7999', 'Y', '3469', 'H', 'K', 'M', '2153', 'N', 'P', '9777', '3073']
[EX A]:
MKH9643Y