#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
const int N = 1e6 + 10;
int t, n, m, k, l, r, op, x, y;
int f[N];
bool flag;
string str;
void solve() {
    while (cin >> str) {
        str.push_back('.');
        flag = true;
        x = 0;
        for (char ch : str) {
            if (ch == '.') {
                if (x > 255) {
                    flag = false;
                    break;
                }
                x = 0;
            } else {
                if (ch == '-') {
                    flag = false;
                    break;

                }
                x = x * 10 + ch - '0';
            }
        }
        if (flag) {
            cout << "Yes!";
        } else {
            cout << "No!";
        }
        cout << "\n";
    }
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    solve();
    return 0;
}