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]: 4, 7, ['1247', 's', 'J', 'w', 'X', '7211', 'c']
[EX A]: c1127Xw

[EX Q]: 8, 16, ['7751', 'Q', '9819', 'k', 'g', 'y', 'W', 'I', '6371', '9859', 'f', '7055', 's', 'I', 'W', '3029']
[EX A]: 9203WIs5507f95891736I

[EX Q]: 8, 8, ['U', '783', '9779', 'o', '2245', '9473', 'a', '5573']
[EX A]:
3755