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Two integers A and B are given. We are interested in positions at which the decimal representation of A occurs as a substring in the decimal representation of B (counting from 0). For example: 53 occurs in 1953786 at position 2. 78 occurs in 195378678 at positions 4 and 7. 57 does not occur in 153786. Decimal representations are assumed to be big-endian and without leading zeros (the only exception being the number 0, whose decimal representation is "0"). Write a function def solution (A, B) that, given two integers A and B, returns the leftmost position at which A occurs in B. The function should return -1 if A does not occur in B. For example, given A = 53 and B = 1953786, the function should return 2, as explained above. Assume that: A and B are integers within the range [0..999,999,999]. In your solution, focus on correctness. The performance of your solution will not be the focus of the assessment.