G. Hamming Distance
time limit per test
2 seconds
memory limit per test
256 megabytes
input
stdin
output
stdout

Hamming distance between two strings of equal length is the number of positions at which the corresponding symbols are different. You are given two strings; calculate the distance between them.

Input

The input consists of two lines. Each line contains a string of characters 'A'-'Z' between 1 and 100 characters, inclusive. The strings have equal length.

Output

Output Hamming distance between the strings.

Examples
Input
CODECHEF
TOPCODER
Output
6
Input
HAMMING
DISTANC
Output
6