public class MyClass {
static boolean same_frequencies(String s) {
int[] letters = new int[256];
int len = s.length();
for (int i = 0; i < len; i++) {
if (Character.isLetter(s.charAt(i)))
letters[(int)s.charAt(i)]++;
}
int frequencies = 0;
for (int i = 0; i < 256; i++) {
if (letters[i] != 0) {
frequencies = letters[i];
break;
}
}
for (int i = 0; i < 256; i++) {
if (letters[i] != 0 && (letters[i] != frequencies)) {
return false;
}
}
return true;
}
public static void main(String args[]) {
String s = "aaabbbcccwww";
if (same_frequencies(s))
System.out.println("yes");
else
System.out.println("no");
}
}
/*
run:
yes
*/