import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
StringBuilder sb = new StringBuilder();
int length = sc.nextInt();
int n = sc.nextInt();
String num = Integer.toString(n);
String[] numArr = new String[length];
int count = 1;
for(int i = length - 1; i >= 0; i --) {
if(count%3 == 0 && length > 3 && i != 0) {
numArr[i] = "," + String.valueOf(num.charAt(i));
} else {
numArr[i] = String.valueOf(num.charAt(i));
}
count++;
}
for(String str : numArr) {
sb.append(str);
}
System.out.println(sb);
}
}
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