s="kyoprotenkei90"
dec=dict()
for i in s:
    if i not in dec:dec[i]=1
    else:dec[i]+=1
# print("AA;",dec)
ss=input()
for j in ss:
    if j not in dec:
        # print("j:",j)
        print("No");exit()
    else:
        dec[j]-=1
        # print("A:",dec[j],j)
        if dec[j]<0:print("No");exit()
print("Yes")