import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Main1159 {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int N = Integer.parseInt(br.readLine()); //선수 수 N
String [] p = new String[N];
int[] a = new int[26];
for(int i=0; i<N; i++) {
p[i] = br.readLine();
a[p[i].charAt(0)-'a']++;
}
int state = 0;
for(int i=0; i<26; i++) {
if(a[i] >= 5) {
state = 1;
char c = (char) (i+'a');
System.out.print(c);
}
}
if(state == 0) {
System.out.println("PREDAJA");
}
}
}
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