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.

1, 3, ['8015', 'y', 'r', '8077', 'U']
ry5108

1, 7, ['4177', 'T', 'Q', '915', '7823', 'm', '6453']
3546m3287519QT7714

1, 3, ['S', 'g', 'C', '5901', '7951', '6237']

CgS