134. Alarming String
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard 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.

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