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, 7, ['6083', 'j', 'x', 'K', 'p', 'M', 'u', '4969', '2423', 'w', 'v', 'S', 'Y', 'v', '5165', 'Y', '3127', '79', '9755', 'Y', 'B', '7395', '6093', 'k', '2043', '6807']

Ex Output:
uMpK


Ex Input:
2, 3, ['2923', 'F', '4033', 'V']

Ex Output:
3304F


Ex Input:
6, 15, ['7605', '7569', 'r', '7387', 'l', '8371', 'i', 'n', 't', '5243', 'V', '2963', 'D', 'm', 'Q', 'P', 'G', '7715']

Ex Output:

QmD3692V3425tni1738