#578. How many 's' letters?
You are given a text made of small Latin letters. Count how many times the letter `s` appears.
### Input
One line of text.
### Output
A number.
Examples
Input
kayak refer scratch
Output
1
Input
planet rocket number music castle mouse
Output
3
💡 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.