from collections import defaultdict
D = defaultdict(int)
for c in "90kyoprotenkei":
    D[c] += 1
D2 = defaultdict(int)
for c in input().strip():
    D2[c] += 1

if len(D) != len(D2):
    print("No")
else:
    for c in D:
        if D[c] != D2[c]:
            print("No")
            break
    else:
        print("Yes")