instruction:
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.
question:
10, 11, ['6929', 'l', '8541', 'L', '7495', '7707', '8839', '6687', 'L', '5125', 'd', 'F', '7', '4357', 'w', 'R', '2459', '9871', 'E', '299', '5967', 'T']
answer:
d5215


question:
4, 9, ['g', '6285', 'B', 'l', '5153', 'n', '9751', 'X', 'w', '2291', 'S']
answer:
wX1579n3515l


question:
15, 18, ['n', 'F', '143', '4185', 'f', '4997', '8303', 'r', '8719', 'u', '8885', 'j', '435', '2631', '4301', '7691', '8675', '2637', '3099', 'm', '4445', 'V']
answer:

7362576819671034