class Solution:
    def removeDuplicates(self, nums):
        """
        :type nums: List[int]
        :rtype: int
        """
        i = 0
        s = 0
        if len(nums)!=0:
            count= 1
        else:
            count=0
        num=[]

        while(1):
            if(i>len(nums)-2):
                break
 

            if(nums[i]==nums[i+1]):
                i=i+1
            else:
                nums[s+1]=nums[i+1]
                s=s+1
                i=i+1
                count=count+1
        num=nums[0:count]
        return count