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<a; i++){
            if(s.charAt(i)=='-') flag =false;
        }
        if(s.charAt(a)!= '-') flag = false;

        for(int i=a+1; i<s.length(); i++){
            if(s.charAt(i)=='-') 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<a; i++){
            if(s.charAt(i)=='-') flag =false;
        }
        if(s.charAt(a)!= '-') flag = false;

        for(int i=a+1; i<s.length(); i++){
            if(s.charAt(i)=='-') 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<a; i++){
            if(s.charAt(i)=='-') flag =false;
        }
        if(s.charAt(a)!= '-') flag = false;

        for(int i=a+1; i<s.length(); i++){
            if(s.charAt(i)=='-') 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<a; i++){
            if(s.charAt(i)=='-') flag =false;
        }
        if(s.charAt(a)!= '-') flag = false;

        for(int i=a+1; i<s.length(); i++){
            if(s.charAt(i)=='-') 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<a; i++){
            if(s.charAt(i)=='-') flag =false;
        } int i=0; int i=0; i 0 i<a i a i++ i++ i {
            if(s.charAt(i)=='-') flag =false;
        } {
            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 if(s.charAt(a)!= '-') flag = false; s.charAt(a)!= '-' s.charAt(a) s.charAt s a '-' flag = false flag false for(int i=a+1; i<s.length(); i++){
            if(s.charAt(i)=='-') flag = false;
        } int i=a+1; int i=a+1; i a+1 a 1 i<s.length() i s.length() s.length s i++ i++ i {
            if(s.charAt(i)=='-') flag = false;
        } {
            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 if(flag) System.out.println("Yes");
        else System.out.println("No"); flag 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 flag = true;

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

        for(int i=a+1; i<s.length(); i++){
            if(s.charAt(i)=='-') 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<a; i++){
            if(s.charAt(i)=='-') flag =false;
        }
        if(s.charAt(a)!= '-') flag = false;

        for(int i=a+1; i<s.length(); i++){
            if(s.charAt(i)=='-') 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<a; i++){
            if(s.charAt(i)=='-') flag =false;
        }
        if(s.charAt(a)!= '-') flag = false;

        for(int i=a+1; i<s.length(); i++){
            if(s.charAt(i)=='-') flag = false;
        }
        if(flag) System.out.println("Yes");
        else System.out.println("No");
    }
}