#include <bits/stdc++.h>
#define int long long  
#define all(a) a.begin(),a.end() 
using namespace std; 
char to_lower(char x){
	if('A'<=x&&x<='Z') return (x-('A'-'a')) ; 
	return x ; 
}
void solve(){
	string a ;
	cin>>a ; 
	string x = "atypical"; 
	int lol = 0  ; 
	for(char y: a){
		if(x[lol]==to_lower(y)){
			++lol ; 
		}
		if(lol==x.size()){
			cout << "Yes" ;
			return ; 
		}
	}
	cout << "No" ;
}
signed main(){
	ios_base::sync_with_stdio(0); 
	cin.tie(nullptr) ; 
	int n =1; 
	while(n--){
		solve() ; 
		cout << '\n' ; 
	}
}