// compile: g++ -o data data.cpp -O3 -std=gnu++20 -Wall -Wextra -Wshadow -D_GLIBCXX_ASSERTIONS -ggdb3 -fmax-errors=2 -DLOCAL
// run: ./data
#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#ifdef LOCAL
#include <debug/codeforces.h>
#define debug(x...) {_variables(#x);_print(x);}
#else
#define debug(x...)
#endif
template<typename...Args> void print_(Args...args){((cout<<args<<" "),...)<<endl;}
#define rep(i,a,b) for(int i=(a);i<(int)(b);++i)
#define sz(v) ((int)(v).size())
#define print(...) print_(__VA_ARGS__);
#define INTINF (int)(9223372036854775807)
#define int long long
#define MAXN 200010
 
 
 
int32_t main() {
    ios::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
 
    string s; cin >> s;
    int n = s.length();
    if (n != 8) {
        cout << "No" << endl;
        return 0;
    }
    if (s[0] < 'A' || s[0] > 'Z' || s[n-1] < 'A' || s[n-1] > 'Z') {
        cout << "No" << endl;
        return 0;
    }
    if (s[1] < '1' || s[1] > '9') {
        cout << "No" << endl;
        return 0;
    }
    for (int i = 2; i < n-1; ++i) {
        if (s[i] < '0' || s[i] > '9') {
            cout << "No" << endl;
            return 0;
        }
    }
    cout << "Yes" << endl;
 
    return 0;
}