import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        String s = sc.next();
        Boolean flag = true;

        for(int i =0;i<s.length();i++){
            if(i==a){
                if(s.charAt(i)!='-'){
                    flag = false;
                }
            }else{
                if(!(s.charAt(i)>=48 && s.charAt(i)<=57)){
                    flag = false;
                }
            }
        }
        
        if(flag){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
        
    }
} import java.util.*; util.* java public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        String s = sc.next();
        Boolean flag = true;

        for(int i =0;i<s.length();i++){
            if(i==a){
                if(s.charAt(i)!='-'){
                    flag = false;
                }
            }else{
                if(!(s.charAt(i)>=48 && s.charAt(i)<=57)){
                    flag = false;
                }
            }
        }
        
        if(flag){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
        
    }
} Main public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        String s = sc.next();
        Boolean flag = true;

        for(int i =0;i<s.length();i++){
            if(i==a){
                if(s.charAt(i)!='-'){
                    flag = false;
                }
            }else{
                if(!(s.charAt(i)>=48 && s.charAt(i)<=57)){
                    flag = false;
                }
            }
        }
        
        if(flag){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
        
    } main {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        String s = sc.next();
        Boolean flag = true;

        for(int i =0;i<s.length();i++){
            if(i==a){
                if(s.charAt(i)!='-'){
                    flag = false;
                }
            }else{
                if(!(s.charAt(i)>=48 && s.charAt(i)<=57)){
                    flag = false;
                }
            }
        }
        
        if(flag){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
        
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int b = sc.nextInt(); b sc.nextInt() sc.nextInt sc String s = sc.next(); s sc.next() sc.next sc Boolean flag = true; flag true for(int i =0;i<s.length();i++){
            if(i==a){
                if(s.charAt(i)!='-'){
                    flag = false;
                }
            }else{
                if(!(s.charAt(i)>=48 && s.charAt(i)<=57)){
                    flag = false;
                }
            }
        } int i =0; int i =0; i 0 i<s.length() i s.length() s.length s i++ i++ i {
            if(i==a){
                if(s.charAt(i)!='-'){
                    flag = false;
                }
            }else{
                if(!(s.charAt(i)>=48 && s.charAt(i)<=57)){
                    flag = false;
                }
            }
        } {
            if(i==a){
                if(s.charAt(i)!='-'){
                    flag = false;
                }
            }else{
                if(!(s.charAt(i)>=48 && s.charAt(i)<=57)){
                    flag = false;
                }
            }
        } if(i==a){
                if(s.charAt(i)!='-'){
                    flag = false;
                }
            }else{
                if(!(s.charAt(i)>=48 && s.charAt(i)<=57)){
                    flag = false;
                }
            } i==a i a {
                if(s.charAt(i)!='-'){
                    flag = false;
                }
            } if(s.charAt(i)!='-'){
                    flag = false;
                } s.charAt(i)!='-' s.charAt(i) s.charAt s i '-' {
                    flag = false;
                } flag = false flag false {
                if(!(s.charAt(i)>=48 && s.charAt(i)<=57)){
                    flag = false;
                }
            } if(!(s.charAt(i)>=48 && s.charAt(i)<=57)){
                    flag = false;
                } !(s.charAt(i)>=48 && s.charAt(i)<=57) (s.charAt(i)>=48 && s.charAt(i)<=57) s.charAt(i)>=48 s.charAt(i) s.charAt s i 48 s.charAt(i)<=57 s.charAt(i) s.charAt s i 57 {
                    flag = false;
                } flag = false flag false if(flag){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        } flag {
            System.out.println("Yes");
        } System.out.println("Yes") System.out.println System.out System System.out "Yes" {
            System.out.println("No");
        } System.out.println("No") System.out.println System.out System System.out "No" String[] args args public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        String s = sc.next();
        Boolean flag = true;

        for(int i =0;i<s.length();i++){
            if(i==a){
                if(s.charAt(i)!='-'){
                    flag = false;
                }
            }else{
                if(!(s.charAt(i)>=48 && s.charAt(i)<=57)){
                    flag = false;
                }
            }
        }
        
        if(flag){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
        
    }
} public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        String s = sc.next();
        Boolean flag = true;

        for(int i =0;i<s.length();i++){
            if(i==a){
                if(s.charAt(i)!='-'){
                    flag = false;
                }
            }else{
                if(!(s.charAt(i)>=48 && s.charAt(i)<=57)){
                    flag = false;
                }
            }
        }
        
        if(flag){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
        
    }
} Main
import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        String s = sc.next();
        Boolean flag = true;

        for(int i =0;i<s.length();i++){
            if(i==a){
                if(s.charAt(i)!='-'){
                    flag = false;
                }
            }else{
                if(!(s.charAt(i)>=48 && s.charAt(i)<=57)){
                    flag = false;
                }
            }
        }
        
        if(flag){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
        
    }
}
