class Solution:
def getCommon(self, nums1: List[int], nums2: List[int]) -> int:
left = right = 0
while left < len(nums1) and right < len(nums2):
if nums1[left] == nums2[right]:
return nums1[left]
elif nums1[left] < nums2[right]:
left += 1
else:
right += 1
return -1
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