class Solution:
    def twoSum(self, numbers: List[int], target: int) -> List[int]:

        start = 0
        end = len(numbers) - 1

        while(start < end):
            num_sum = numbers[start] + numbers[end]
            if num_sum == target:
                return [start+1, end+1]
            elif num_sum < target:
                start += 1
            else:
                end = end - 1

        return []