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, 5, ['C', '4345', 'T', 't', 'U', 'p']
[EX A]: UtT

[EX Q]: 7, 18, ['s', 'a', 'q', '6573', '7757', '7229', '9149', '7563', '2171', 'L', 'F', 'S', '4337', '3071', 'Q', 'A', '6987', '2529', '2489', 'y', '359', '3065', 'h']
[EX A]: 92527896AQ17037334SFL171236579419

[EX Q]: 14, 19, ['2487', 'z', '4131', 'I', 'k', 'o', 'T', '5069', '2815', 'b', '1097', 'E', '3231', 'k', '7187', '717', '3039', 'm', 'X', 'M', '9547', '2727', 'L', '8193', '3519', '3619']
[EX A]:
Xm93037177817k