#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned ll
#define nl "\n"
#define sz(x) x.size()
#define NumOfDigit(w) log10(w) + 1
#define fill(arr, val)  memset(arr, val , sizeof(arr))
#define PI 3.141592654
#define ceil(w, m) (((w) / (m)) + ((w) % (m) ? 1 : 0))
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define fi first
#define se second
#define cin(v) for (auto&i:v) cin >> i;
#define cout(v) for (auto&i:v) cout << i << " ";
#define fixed(n) fixed << setprecision(n)
#define MOD  1000000007


void IO(){
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
}
void files(){
    //freopen("filename.in" , "r" ,stdin);
            #ifndef ONLINE_JUDGE
            freopen("input.txt", "r", stdin);  freopen("output.txt", "w", stdout);
            #endif
}


void solve(){

string s ;
cin >> s ;
if(sz(s) !=8) return void(cout <<"No");
int n=sz(s);
if(s[0]>='A' and s[n-1] >='A' and s[0]<='Z' and s[n-1] <='Z' and
s[1]>='1' and s[1] <='9' and s[2]>='0' and s[2] <='9' and
s[3]>='0' and s[3] <='9' and s[4]>='0' and s[4] <='9' and
s[5]>='0' and s[5] <='9' and s[6]>='0' and s[6] <='9'
)
cout <<"Yes";
else cout <<"No";


}


int main(){
                 IO();    //     files();


    int testCase=1;  // one test case
      // cin >> testCase ;
 while(testCase--)
        solve();  // my code

    return 0;
}