S = str(input())
M = {'k':0,'a':[],'d':0,'o':0,'m':0,'t':0,'s':0,'u':0}
J = {'k':1,'a':[2,6],'d':3,'o':4,'m':5,'t':7,'s':8,'u':9}
KADOMATSU = "kadomatsu"
num = 0
l = ['']*11
ans = "Yes"
for s in S:
    num += 1
    if s in KADOMATSU:
        if s == 'a':
            len_a = len(M[s])
            if len_a < 2:
                M[s].append(num)
                l[num] = s
            else:
                ans = "No"
                break
        else:
            if M[s] == 0:
                M[s] = num
                l[num] = s
            else:
                ans = "No"
                break
    else:
        ans = "No"
        break
if ans == "Yes":
    S = ''.join(l)
    now = 0
    count_a = 0
    for s in S:
        if s == 'a':
            if J[s][count_a] < now:
                ans = "No"
            now = J[s][count_a]
            count_a += 1
        else:
            if J[s] < now:
                ans = "No"
            now = J[s]
    print(ans)
else:
    print(ans)