s = "kyoprotenkei90"
d = dict()
for i in s:
    if i not in d:
        d[i] = 1
    else:
        d[i] += 1

S = input()
D = dict()
for i in S:
    if i not in D:
        D[i] = 1
    else:
        D[i] += 1

if d == D:
    print("Yes")
else:
    print("No")