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 concatenate all elements of A from the ith element to the jth element, and print 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.
question:
6, 9, ['7139', 'Z', '4407', '9791', 'F', '139', '4927', 's', '4721', 'Y']
answer:
1394927s4721


question:
5, 10, ['5897', 'u', 'w', 'S', '6063', '4879', '6021', 'M', '6205', 'N', 'N', '5923', '651', '817', 'M', 'w', '8581']
answer:
606348796021M6205N


question:
2, 2, ['X', '31', '7157', '2947', '9449', 'w', 'j', 'H', 'x']
answer:

31