import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
String[] split = in.nextLine().split("[a-z]+");
int len = 0;
for (String s : split) {
if (s.isEmpty()) continue;
if (s.length() > len) len = s.length();
}
for (String s : split) {
if (s.isEmpty()) continue;
if (s.length() == len) System.out.print(s);
}
System.out.printf(",%d", len);
in.close();
}
}



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