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Problem 389: Find The Difference

Difficulty: Easy

Problem

Given two strings s and t which consist of only lowercase letters.

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

Find the letter that was added in t.

Example

Input:
s = "abcd"
t = "abcde"

Output:
e

Explanation:
'e' is the letter that was added.