from collections import defaultdict 

def main():
    dic0 = defaultdict(int)
    s = "kyoprotenkei90"
    for i in range(len(s)):
        dic0[s[i]] += 1
    dic1 = defaultdict(int)
    t = str(input())
    for i in range(len(t)):
        dic1[t[i]] += 1
    if dic0 == dic1:
        print('Yes')
    else:
        print('No')


if __name__ == '__main__':
    main()