Problem Statement

You will be given a string S of length 3 representing the weather forecast for three days in the past.
The $i-th character (1 \leq i \leq 3)$ of S represents the forecast for the i-th day. S, C, and R stand for sunny, cloudy, and rainy, respectively.
You will also be given a string T of length 3 representing the actual weather on those three days.
The $i-th character (1 \leq i \leq 3)$ of S represents the actual weather on the i-th day. S, C, and R stand for sunny, cloudy, and rainy, respectively.
Print the number of days for which the forecast was correct.

Input

Input is given from Standard Input in the following format:
S
T

Output

Print the number of days for which the forecast was correct.

Constraints

• S and T are strings of length 3 each.
• S and T consist of S, C, and R.

Sample Input 1

CSS
CSR

Sample Output 1

2

• For the first day, it was forecast to be cloudy, and it was indeed cloudy.
• For the second day, it was forecast to be sunny, and it was indeed sunny.
• For the third day, it was forecast to be sunny, but it was rainy.

Thus, the forecast was correct for two days in this case.

Sample Input 2

SSR
SSR

Sample Output 2

3

Sample Input 3

RRR
SSS

Sample Output 3

0

见题面 Input 部分

见题面 Output 部分