s = str(input())
t = 'kadomatsu'
n = len(t)
for i in range(2**n):
    temp = []
    for j in range(n):
        if (i>>j)&1:
            temp.append(t[j])
    temp = ''.join(temp)
    if temp == s:
        print('Yes')
        exit()
else:
    print('No')