## 题目描述

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.``````

## 解法一

### Python

``````class Solution(object):
def findTheDifference(self, s, t):
"""
:type s: str
:type t: str
:rtype: str
"""
result_ord = 0
for item in s:
result_ord ^= ord(item)
for item in t:
result_ord ^= ord(item)
return chr(result_ord)``````

### Java

``````public class Solution {
public char findTheDifference(String s, String t) {
char result = 0;
for (char item : s.toCharArray()) {
result ^= item;
}
for (char item : t.toCharArray()) {
result ^= item;
}
return result;
}
}``````

### C++

``````class Solution {
public:
char findTheDifference(string s, string t) {
char result = 0;
for (char item : s) {
result ^= item;
}
for (char item : t) {
result ^= item;
}
return result;
}
};``````