#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int,int>;
const int N = 1e6+10;
int t,n,m,k,l,r,op,x,y;
int f[N];
void solve(){
    cin>>x;
    if(x==100)x-=1;
    if(x<60){
        cout<<"E";
    }else cout<<(char)('D'-(x/10-6));
}
int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);  
    solve();
    return 0;
}