package zju;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
public class TheMostChar {
/**
* , , !
* @throws IOException
*/
public static void main(String[] args) throws IOException {
String str=null;
int max=0;
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.print(" :");
str=br.readLine();
br.close();
Map<Character,Integer> m=new HashMap<Character,Integer>();
for(int i=0;i<str.length();i++){
char c=str.charAt(i);
if(m.containsKey(c)){
m.put(c,m.get(c)+1);
if(max<m.get(c)+1){
max=m.get(c);
}
}else{
m.put(c,1);
}
}
Set<Character> S=m.keySet();
for(char cc:S){
if(m.get(cc)==max){
System.out.println(" "+cc+" "+max+" ");
}
}
}
}