#D10895. Minor Change
Minor Change
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
inputFormat
Input
Input is given from Standard Input in the following format:
S T
outputFormat
Output
Print the answer.
Examples
Input
cupofcoffee cupofhottea
Output
4
Input
abcde bcdea
Output
5
Input
apple apple
Output
0
样例
apple
apple0