instruction:
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.
question:
2, 4, ['v', '807', 'C', 'n', '7213', 'l', '5943']
answer:
nC807


question:
2, 5, ['e', '7607', '3201', '3421', 'H', '543', '3489']
answer:
H342132017607


question:
12, 18, ['S', '2745', 'X', '5661', 'w', 'W', '9873', 'Y', 'e', 'X', 'e', '1565', 'a', 'd', '4615', '6885', 'R', 'U', 'i', '6459', 'z', 'G', 'V', 'k', '233', 'O', '743', '2041']
answer:

UR68854615da1565