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 ebishu = true;
                for(int i = 0 ; i < a + b + 1 ; i++){
                        if(i != a){
                                if(s.charAt(i) < 48 || s.charAt(i) > 58){
                                        ebishu = false;
                                }
                        }
                }
                if(s.charAt(a) != '-') ebishu = false;
                if(ebishu) 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 ebishu = true;
                for(int i = 0 ; i < a + b + 1 ; i++){
                        if(i != a){
                                if(s.charAt(i) < 48 || s.charAt(i) > 58){
                                        ebishu = false;
                                }
                        }
                }
                if(s.charAt(a) != '-') ebishu = false;
                if(ebishu) 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 ebishu = true;
                for(int i = 0 ; i < a + b + 1 ; i++){
                        if(i != a){
                                if(s.charAt(i) < 48 || s.charAt(i) > 58){
                                        ebishu = false;
                                }
                        }
                }
                if(s.charAt(a) != '-') ebishu = false;
                if(ebishu) 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 ebishu = true;
                for(int i = 0 ; i < a + b + 1 ; i++){
                        if(i != a){
                                if(s.charAt(i) < 48 || s.charAt(i) > 58){
                                        ebishu = false;
                                }
                        }
                }
                if(s.charAt(a) != '-') ebishu = false;
                if(ebishu) 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 ebishu = true; ebishu true for(int i = 0 ; i < a + b + 1 ; i++){
                        if(i != a){
                                if(s.charAt(i) < 48 || s.charAt(i) > 58){
                                        ebishu = false;
                                }
                        }
                } int i = 0 ; int i = 0 ; i 0 i < a + b + 1 i a + b + 1 a + b + 1 a b 1 i++ i++ i {
                        if(i != a){
                                if(s.charAt(i) < 48 || s.charAt(i) > 58){
                                        ebishu = false;
                                }
                        }
                } {
                        if(i != a){
                                if(s.charAt(i) < 48 || s.charAt(i) > 58){
                                        ebishu = false;
                                }
                        }
                } if(i != a){
                                if(s.charAt(i) < 48 || s.charAt(i) > 58){
                                        ebishu = false;
                                }
                        } i != a i a {
                                if(s.charAt(i) < 48 || s.charAt(i) > 58){
                                        ebishu = false;
                                }
                        } if(s.charAt(i) < 48 || s.charAt(i) > 58){
                                        ebishu = false;
                                } s.charAt(i) < 48 || s.charAt(i) > 58 s.charAt(i) < 48 s.charAt(i) s.charAt s i 48 s.charAt(i) > 58 s.charAt(i) s.charAt s i 58 {
                                        ebishu = false;
                                } ebishu = false ebishu false if(s.charAt(a) != '-') ebishu = false; s.charAt(a) != '-' s.charAt(a) s.charAt s a '-' ebishu = false ebishu false if(ebishu) System.out.println("Yes");
                else System.out.println("No"); ebishu System.out.println("Yes") System.out.println System.out System System.out "Yes" 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 ebishu = true;
                for(int i = 0 ; i < a + b + 1 ; i++){
                        if(i != a){
                                if(s.charAt(i) < 48 || s.charAt(i) > 58){
                                        ebishu = false;
                                }
                        }
                }
                if(s.charAt(a) != '-') ebishu = false;
                if(ebishu) 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 ebishu = true;
                for(int i = 0 ; i < a + b + 1 ; i++){
                        if(i != a){
                                if(s.charAt(i) < 48 || s.charAt(i) > 58){
                                        ebishu = false;
                                }
                        }
                }
                if(s.charAt(a) != '-') ebishu = false;
                if(ebishu) 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 ebishu = true;
                for(int i = 0 ; i < a + b + 1 ; i++){
                        if(i != a){
                                if(s.charAt(i) < 48 || s.charAt(i) > 58){
                                        ebishu = false;
                                }
                        }
                }
                if(s.charAt(a) != '-') ebishu = false;
                if(ebishu) System.out.println("Yes");
                else System.out.println("No");
        }
}