// 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;
}
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