Tenki

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.

Constraints

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

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.

Examples

Input

CSS CSR

Output

2

Input

SSR SSR

Output

3

Input

RRR SSS

Output

0

inputFormat

Input

Input is given from Standard Input in the following format:

S T

outputFormat

Output

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

Examples

Input

CSS CSR

Output

2

Input

SSR SSR

Output

3

Input

RRR SSS

Output

0

样例

CSS
CSR

2