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:
1, 3, ['7635', 'c', 'h', 'D', 'K', '7235', 'e']

Ex Output:
hc5367


Ex Input:
2, 11, ['N', '5989', '9485', '1955', '4841', '8403', 'f', 'M', '3261', '9581', '8083', '5201', '6391', 'h', 'C', 'O', '6361', '4033', '9121', '9825']

Ex Output:
380818591623Mf30481484559158499895


Ex Input:
20, 20, ['n', '7231', '7543', '3417', '5015', 'v', '5219', 'B', '9491', 'C', '5739', 'w', '5187', 'd', '1849', '4927', 'd', '595', '5861', 'c', '6949', '9539', 'M', 'P', 'k', 'f', '9797', 'U']

Ex Output:

c