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.

5, 7, ['2725', '1489', 'P', '2021', 'c', '1605', 'R', 'T', 'p', 'q', '6487', '3395', 'u', 'x']
R5061c

5, 11, ['4381', '7607', '3995', '7639', 'W', '2377', '2639', 'Z', 'D', '4511', 'K', '3211', '6939', 'n', 'J', 'd', '9647']
K1154DZ93627732W

3, 16, ['9515', '5119', '7277', '3513', '2867', 'r', 'q', 'l', '3721', 'e', '7667', 'k', 'f', '2691', '9281', 'm', 'w', 'Z', '5679', 'S', 'd', 'O', '5287', '933']

m18291962fk7667e1273lqr768231537727