package p2084;
import java.util.Scanner;
/*
public class P2084 {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		//输入m和n
		int m = sc.nextInt();
		String n = sc.next();
		String res = "";
		//System.out.println(n.length());
		if(m<10 && m>0 && n.length()<1000){
			for(int i=0;i<n.length();++i){
				if(n.charAt(i)!= '0'){
					res += ( n.charAt(i) + "*" + Integer.toString(m) + "^" + Integer.toString(n.length()-i-1) + "+" );
				}else{
					continue;
				}
			}
			res = res.substring(0,res.length()-1);
			System.out.print(res);
		}
	}
}
*/
public class P2084{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		//输入m和n
		int m = sc.nextInt();
		char[] n = new char[1001];
		String res = "";
		n = sc.next().toCharArray();
		for(int j=0;j<n.length;++j){
			if(n[j] != '0'){
				res += ( n[j] +"*" + Integer.toString(m) + "^" + Integer.toString(n.length-1-j) + "+" );
			}else{
				continue;
			}
		}
		res = res.substring(0,res.length()-1);
		System.out.print(res);
	}
}