p02622 AtCoder Beginner Contest 172 - Minor Change
Given are strings S and T. Consider changing S to T by repeating the operation below. Find the minimum number of operations required to do so.

Operation: Choose one character of S and replace it with a different character.

Constraints

* S and T have lengths between 1 and 2\times 10^5 (inclusive).
* S and T consists of lowercase English letters.
* S and T have equal lengths.

Input

Input is given from Standard Input in the following format:


S
T


Output

Print the answer.

Examples

Input

cupofcoffee
cupofhottea


Output

4


Input

abcde
bcdea


Output

5


Input

apple
apple


Output

0
```python
S=input()
T=input()
cc=0
for i in range(len(S)):
    cc+=int(S[i]!=T[i])

print(cc)
```