COCI '18 Contest 3 #1 Magnus

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Points: 5
Time limit: 1.0s
Memory limit: 64M

Problem type
Allowed languages
C, C++, Java, Python

Magnus lost a game of chess to Kile so he found comfort in competitive programming. Very soon, he heard of the iconic COCI competition and decided to try his luck there.

He wrote a mail to Kile: "Dear Kile, please, prepare me for COCI. Magnus".

Kile replied: "You want to participate in COCI? All right, here's your warm-up task. A series of four consecutive letters of some word that make up the subword HONI (Croatian acronym for COCI) is called the HONI-block. I will send you the word of length N and you will throw out as many letters as you want (it might be none as well) so that in the end there are as many HONI-blocks as possible in the word. Kile".

Magnus was very worried and asked you, COCI competitive scene, for help. Help him determine the maximum number of HONI-blocks he can get in the final word.

Input Specification

The first line of input contains a word of length N (1\le N \le 100\,000), consisting of uppercase letters of the English alphabet.

Output Specification

In the first and only line, print out the required number of HONI-blocks.

Sample Input 1


Sample Output 1


Sample Input 2


Sample Output 2


Explanation for Sample Output 2

By throwing out three letters H, O, N and I Magnus can get the word HONI, which contains one HONI-block.

Sample Input 3


Sample Output 3



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