def isAnagram(s, t):
        """
        :type s: str
        :type t: str
        :rtype: bool
        """
        seen = {}
        check = {}
        count = 0
        for letter in s:
            if letter in seen:
                seen[letter] += 1
            else:
                seen[letter] = 1
        for letter in t:
            if letter in check:
                check[letter] += 1
            else:
                check[letter] = 1
        if seen != check:
            return False
        else:
            return True

print(isAnagram("anagram", "nagaram"))
print(isAnagram("rat", "car"))
print(isAnagram("a", "ab"))