#include <bits/stdc++.h>
using namespace std;

struct uns_t {} uns;
template <typename Element, typename Head, typename ...Args>
auto vec(Element init, Head arg, Args ...args) {
    if constexpr (sizeof...(Args) == 0) return std::vector(arg, init);
    else return std::vector(arg, vec(init, args...));
}
template <typename Element, typename Head, typename ...Args>
auto vec(uns_t, Head arg, Args ...args) {
    return vec(Element(), arg, args...);
}

int main() {
    string suf[CHAR_MAX + 1];
    suf['k'] = "adomatsu";
    suf['a'] = "domatsu";
    suf['d'] = "omatsu";
    suf['o'] = "matsu";
    suf['m'] = "atsu";
    suf[0] = "tsu";
    suf['t'] = "su";
    suf['s'] = "u";
    suf['u'] = "";

    string s; cin >> s;

    bool ans = true, found = false;
    for (int i = 0; i < s.size(); ++i) {
        auto c = suf[s[i]];
        if (s[i] == 'a' && found) {
            c = suf[0];
        }
        for (int j = i + 1; j < s.size(); ++j) {
            ans &= !!count(begin(c), end(c), s[j]);
        }
        found |= s[i] == 'a';
    }

    int cnt[CHAR_MAX + 1] = {};
    cnt['k'] += 1;
    cnt['a'] += 1;
    cnt['d'] += 1;
    cnt['o'] += 1;
    cnt['m'] += 1;
    cnt['a'] += 1;
    cnt['t'] += 1;
    cnt['s'] += 1;
    cnt['u'] += 1;

    for (auto c : s) --cnt[c];

    for (auto e : cnt) {
        ans &= 0 <= e;
    }

    cout << (ans && count(begin(s), end(s), 'a') <= 2 ? "Yes" : "No") << endl;
}