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.

4, 4, ['339', '1345', '9749', '6877', 'b', 'K', 'f', '1443']
7786

2, 5, ['Y', 'O', 'Q', 'l', 'E']
ElQO

2, 4, ['1319', '8531', '6845', '2577', 'w', 'n', 'q', '8073', 'X', '4325', '8029']

775254861358