407163: GYM102697 134 Alarming String

Memory Limit：256 MB Time Limit：1 S
Judge Style：Text Compare Creator：
Submit：0 Solved：0

Description

134. Alarming Stringtime limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard output
This problem is worth 10 points.

You define a string to be an alarming string if it contains exactly three "a" characters. Given a string, possibly containing spaces, figure out whether or not it is an alarming string.

Input

The only line of input contains a single string $$$s$$$, consisting of only lowercase characters.

Output

Output "YES" (no quotes) if the given string is an alarming string, as described above, and "NO" (no quotes) otherwise.

ExamplesInput
coderams competition number eleven
Output
NO
Input
aardvark
Output
YES
Input
an apple actually appeared
Output
NO

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