Chat room · Interview Problem

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Codeforces

58/A

Easy

Strings

implementation

Chat room

Determine if a chat room name is valid by checking if it contains the letters 'h', 'e', 'l', 'l', 'o' in order.

Acceptance 0%

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Problem Statement

Core description from the backend problem record.

Description

You are given a string representing a chat room name. You need to determine if the name contains the characters 'h', 'e', 'l', 'l', 'o' as a subsequence (not necessarily contiguous). If it does, print "YES", otherwise print "NO".

Input Format

The input is a single line containing a string consisting of lowercase English letters.

Output Format

Print "YES" if the string contains the subsequence "hello", otherwise print "NO".

Constraints

The length of the chat room name string is between 1 and 100 characters.

Examples

Sample cases returned by the problem API.

Example 1

Input

ahhellllloou

Output

YES

Explanation

The characters 'h','e','l','l','o' appear in order within the given string.

Example 2