import java.util.Scanner;
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 ok = true;
        for(int i = 0;i < s.length();i++){
            if(i == a && s.charAt(a) != '-'){
                ok = false;
            }
            if(i != a && s.charAt(i) == '-'){
                ok = false;
            }
        }

        if(ok){
            System.out.println("Yes");
        }
        else{
            System.out.println("No");
        }
    }
} import java.util.Scanner; Scanner 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 ok = true;
        for(int i = 0;i < s.length();i++){
            if(i == a && s.charAt(a) != '-'){
                ok = false;
            }
            if(i != a && s.charAt(i) == '-'){
                ok = false;
            }
        }

        if(ok){
            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 ok = true;
        for(int i = 0;i < s.length();i++){
            if(i == a && s.charAt(a) != '-'){
                ok = false;
            }
            if(i != a && s.charAt(i) == '-'){
                ok = false;
            }
        }

        if(ok){
            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 ok = true;
        for(int i = 0;i < s.length();i++){
            if(i == a && s.charAt(a) != '-'){
                ok = false;
            }
            if(i != a && s.charAt(i) == '-'){
                ok = false;
            }
        }

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

        if(ok){
            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 ok = true;
        for(int i = 0;i < s.length();i++){
            if(i == a && s.charAt(a) != '-'){
                ok = false;
            }
            if(i != a && s.charAt(i) == '-'){
                ok = false;
            }
        }

        if(ok){
            System.out.println("Yes");
        }
        else{
            System.out.println("No");
        }
    }
} Main
import java.util.Scanner;
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 ok = true;
        for(int i = 0;i < s.length();i++){
            if(i == a && s.charAt(a) != '-'){
                ok = false;
            }
            if(i != a && s.charAt(i) == '-'){
                ok = false;
            }
        }

        if(ok){
            System.out.println("Yes");
        }
        else{
            System.out.println("No");
        }
    }
}
