#553. Common letters
You are given two words. How many different letters appear in both of them?
### Input
Two lines.
### Output
A number.
Examples
Input
banana dragon
Output
2
Input
noon school
Output
1
💡 You can solve it with Python, JavaScript or blocks. Read the input line by line with input(). Don't print a question (like input("Number: ")). Print exactly what the output asks for, nothing more.