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:
4, 4, ['I', 'i', 'b', '2703']

Ex Output:
3072


Ex Input:
1, 3, ['6017', 'o', '1817', 'W']

Ex Output:
7181o7106


Ex Input:
2, 19, ['1139', '2667', '7275', '3451', 'm', '8245', '5033', '5399', '4611', '321', 'b', 'M', 'S', '5551', 't', '8663', 'u', 'G', '8755', '9225', '2729', '9745', 'g', 'l', 'I', 'x']

Ex Output:

5578Gu3668t1555SMb1231164993533055428m154357277662