def main():
    word = 'kyoprotenkei90'
    N = input()
    box = []
    for s in word:
        find_letters = N.find(s)
        if find_letters == -1:
            print('No')
            break
        else:
            box.append(s)
    output = ''.join(box)
    if output == word:
        print('Yes')

            

    
if __name__ == '__main__':
    main()