№1 C++11

#include <iostream>

using namespace std;

int main(){
	string s;
	cin>>s;
	if ((65<=s[0]) && (s[0]<=90) && (65<=s[5]) && (s[5]<=90) && (65<=s[4]) && (s[4]<=90) && (48<=s[1]) && (s[1]<=57) && (48<=s[2]) && (s[2]<=57) && (48<=s[3]) && (s[3]<=57) ) cout<<"Yes";
		else cout<<"No";
}