|시간 제한||메모리 제한||제출||정답||맞은 사람||정답 비율|
|1 초||512 MB||162||88||75||51.370%|
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.
The first line contains a word of length N (1 ≤ N ≤ 100 000), consisting of uppercase letters of the English alphabet.
In the first and only line print out the required number of HONI-blocks.
Explanation of the second sample test:
By throwing out three letters ‘H’, ‘O’, ‘N’ or ‘I’ Magnus can get the word “HONI”, which contains one HONI-block.