class Solution:
    def isSubsequence(self, s: str, t: str) -> bool:

        left, right = 0, 0

        while(left < len(s) and right <len(t)):
            if s[left] == t[right]:
                left += 1
                right += 1
            elif s[left] != t[right]:
                right += 1

        if left == len(s):
            return True

        return False