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.

if __name__ == '__main__':
    s=input()
    count=0
    for i in s:
        if i=="o":
            count+=1
    if 15- len(s) >=8-count:
        print("Yes")
    else:
        print("No")
if __name__ == '__main__':
    s=input()
    count=0
    for i in s:
        if i=="o":
            count+=1
    if 15- len(s) >=8-count:
        print("YES")
    else:
        print("NO")