```
class Solution(object):
def twoSum(self, numbers, target):
left, right = 0, len(numbers) - 1
tmp = numbers[left] + numbers[right]
while left < right and tmp != target:
tmp = numbers[left] + numbers[right]
if tmp > target:
right -= 1
elif tmp < target:
left += 1
return [left + 1, right + 1]
```