#include <iostream>
#include <cstring>

using namespace std;

const int N = 1010;

char s[N];
char a[4] = {'E','A','S','Y'};

int main(){

    while(cin >> s){
        int n = strlen(s);
        int i,j = 0;
        for(i=0,j=0;j<n;j++){

            if(a[i] == s[j])
                i++;

            if(i == 4)
                break;
        }
        if(i == 4){
            puts("easy");
        }else{
            puts("difficult");
        }

    }

    return 0;
}