Problem:
Score : 200 points

Problem Statement

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.

Sample Input 1

cupofcoffee
cupofhottea

Sample Output 1

4

We can achieve the objective in four operations, such as the following:

First, replace the sixth character c with h.

Second, replace the eighth character f with t.

Third, replace the ninth character f with t.

Fourth, replace the eleventh character e with a.

Sample Input 2

abcde
bcdea

Sample Output 2

5

Sample Input 3

apple
apple

Sample Output 3

0

No operations may be needed to achieve the objective.

Solution in JavaScript (Node.js 12.16.1) (judge verdict: Accepted)

function Main(input) {
    tmp = input.split("\n");
    s = tmp[0];
    t = tmp[1];
    sArry = s.split('');
    tArry = t.split('');
    count = 0;

    for (let i = 0; i < sArry.length; i++) {
        if (sArry[i] != tArry[i]) {
            count += 1;
        }        
    }
    
    console.log(count);
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));