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# 389. Find the Difference

## Description

You are given two strings s and t.

String t is generated by random shuffling string s and then add one more letter at a random position.

Return the letter that was added to t.

Example 1:

Input: s = "abcd", t = "abcde"
Output: "e"
Explanation: 'e' is the letter that was added.


Example 2:

Input: s = "", t = "y"
Output: "y"


Example 3:

Input: s = "a", t = "aa"
Output: "a"


Example 4:

Input: s = "ae", t = "aea"
Output: "a"


Constraints:

• 0 <= s.length <= 1000
• t.length == s.length + 1
• s and t consist of lower-case English letters.