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:
1, 11, ['5203', 'Z', 'L', '6889', '9707', '707', '1999', 'T', 'H', 'p', '2013', 'O', '7451']
answer:
3102pHT999170770799886LZ3025


question:
4, 9, ['d', '1057', '5737', '6925', '6365', 'y', 'w', '6535', 'P', 'F']
answer:
P5356wy56365296


question:
4, 11, ['U', 'S', 'm', '5727', 'y', '3479', 'i', 'D', '9499', '4167', '7817', 'u', 'M', '7095', 'h', 'b', 'L', '8275', 'm']
answer:

718776149949Di9743y7275