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.

2, 3, ['X', '8243', '1209']
90213428

3, 10, ['g', '5155', 'p', '6627', 'W', 'q', '2851', 'm', 's', '7781', 'u', '9739']
1877sm1582qW7266p

7, 9, ['7571', 's', '1793', 'J', 'r', '1523', '8891', 'J', '6397', '593', '3871', 'N', 'l', 'C', 'c', '2647', '7251', 'D', 'o', 'G', 'f', 'E', '469', 'X', 'l']

7936J1988