Score : $200$ points

Problem Statement

Takahashi is competing in a sumo tournament. The tournament lasts for $15$ days, during which he performs in one match per day. If he wins $8$ or more matches, he can also participate in the next tournament.

The matches for the first $k$ days have finished. You are given the results of Takahashi's matches as a string $S$ consisting of o and x. If the $i$-th character in $S$ is o, it means that Takahashi won the match on the $i$-th day; if that character is x, it means that Takahashi lost the match on the $i$-th day.

Print YES if there is a possibility that Takahashi can participate in the next tournament, and print NO if there is no such possibility.

Constraints

• $1 \leq k \leq 15$
• $S$ is a string of length $k$ consisting of o and x.

Input

Input is given from Standard Input in the following format:

$S$

Output

Print YES if there is a possibility that Takahashi can participate in the next tournament, and print NO otherwise.

oxoxoxoxoxoxox

YES

Takahashi has $7$ wins and $7$ losses before the last match. If he wins that match, he will have $8$ wins.

xxxxxxxx

NO