In this task, you are given inputs i, j, and A, where i and j are integers and A is a list. You need to find all elements of A from the ith element to the jth element, reverse the order in which they occur, and then concatenate them to output the resultant 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 concatenate the elements and then reverse the string.

9, 21, ['d', 'K', '4747', 'J', '5273', 'R', '5449', '6823', '2003', 'M', '3201', 'D', '5025', '5151', 't', '5203', '1073', 'E', 'O', 'M', 'R', '3039', '4781', 'b', '6819', '4025', '9125', '3733', 'x']
RMOE10735203t51515025D3201M2003

8, 14, ['6329', 'O', '8749', 'm', '2825', '6177', 'E', '8475', '907', '5543', 'h', '4737', 'B', '5977']
5977B4737h55439078475

3, 12, ['4187', '2027', '1157', 'x', 'M', 't', '7321', 's', 'c', '9831', '2137', 'H', '241', '7201', 'i', 't', 'x', 'k', 'r', '419']

H21379831cs7321tMx1157