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 Input:
2, 8, ['O', '4833', '7055', '9891', '9117', '1571', 'S', 'Z', '7741', 'W', 't']

Ex Output:
ZS17517119198955073384


Ex Input:
1, 4, ['3633', 'k', '9685', 't']

Ex Output:
t5869k3363


Ex Input:
5, 15, ['7943', '8725', '5779', 'l', '3639', 'i', 'F', 'd', 'L', '8045', '4229', '4891', '833', 'E', '7099', '5897']

Ex Output:

9907E338198492245408LdFi9363