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.

Ex Input:
12, 21, ['e', 'C', '1919', '1409', 'C', '5215', '9709', '1457', 'o', '4769', 'M', '9825', 'M', '1129', '7783', 'S', 'g', '6493', 'P', '6791', 'z', 'F', 'B', 's', 'V', 'N', 'k']

Ex Output:
z6791P6493gS77831129M9825


Ex Input:
4, 6, ['7933', '4733', 'l', 'h', '3833', 'm', '4937', 'l', 'x', '381', 'j']

Ex Output:
m3833h


Ex Input:
20, 20, ['3913', '9863', '4997', 'N', 't', 'g', '9681', 'r', '3887', 'Q', '1103', 'W', 't', '79', 'h', 'h', '7037', 'Y', 'j', 'W', 'F', 'B', '5019', '8131', 'w', 'M', '6093', '5505', 'L']

Ex Output:

W