TASK DEFINITION: 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.
PROBLEM: 4, 4, ['339', '1345', '9749', '6877', 'b', 'K', 'f', '1443']

SOLUTION: 7786

PROBLEM: 5, 7, ['Y', '5101', 'B', '5129', 'a', 'y', 'v', '4577', '5455', '6685', '6435']

SOLUTION: vya

PROBLEM: 17, 18, ['2533', 'v', 'u', 'D', 'b', 'G', 'y', 't', 'R', 'P', '5271', 'E', 'Q', 'f', 'C', '9381', '4855', 'd', '5113']

SOLUTION:
d5584