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();
        
        for (int i = 0; i < A; i++) {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        }
        
        if (S.charAt(A) != '-') {
    		System.out.println("No");
    		return;
        }
        
        for (int i = A+1; i < B+A+1; i++) {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        }
        
        System.out.println("Yes");
    }
    
} 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();
        
        for (int i = 0; i < A; i++) {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        }
        
        if (S.charAt(A) != '-') {
    		System.out.println("No");
    		return;
        }
        
        for (int i = A+1; i < B+A+1; i++) {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        }
        
        System.out.println("Yes");
    }
    
} 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();
        
        for (int i = 0; i < A; i++) {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        }
        
        if (S.charAt(A) != '-') {
    		System.out.println("No");
    		return;
        }
        
        for (int i = A+1; i < B+A+1; i++) {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        }
        
        System.out.println("Yes");
    } main {
        Scanner sc = new Scanner(System.in);
        
        int A = sc.nextInt();
        int B = sc.nextInt();
        
        String S = sc.next();
        
        for (int i = 0; i < A; i++) {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        }
        
        if (S.charAt(A) != '-') {
    		System.out.println("No");
    		return;
        }
        
        for (int i = A+1; i < B+A+1; i++) {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        }
        
        System.out.println("Yes");
    } 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 for (int i = 0; i < A; i++) {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        } int i = 0; int i = 0; i 0 i < A i A i++ i++ i {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        } {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        } if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	} S.charAt(i) == '-' S.charAt(i) S.charAt S i '-' {
        		System.out.println("No");
        		return;
        	} System.out.println("No") System.out.println System.out System System.out "No" return; if (S.charAt(A) != '-') {
    		System.out.println("No");
    		return;
        } S.charAt(A) != '-' S.charAt(A) S.charAt S A '-' {
    		System.out.println("No");
    		return;
        } System.out.println("No") System.out.println System.out System System.out "No" return; for (int i = A+1; i < B+A+1; i++) {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        } int i = A+1; int i = A+1; i A+1 A 1 i < B+A+1 i B+A+1 B+A+1 B A 1 i++ i++ i {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        } {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        } if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	} S.charAt(i) == '-' S.charAt(i) S.charAt S i '-' {
        		System.out.println("No");
        		return;
        	} System.out.println("No") System.out.println System.out System System.out "No" return; System.out.println("Yes") System.out.println System.out System System.out "Yes" 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();
        
        for (int i = 0; i < A; i++) {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        }
        
        if (S.charAt(A) != '-') {
    		System.out.println("No");
    		return;
        }
        
        for (int i = A+1; i < B+A+1; i++) {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        }
        
        System.out.println("Yes");
    }
    
} 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();
        
        for (int i = 0; i < A; i++) {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        }
        
        if (S.charAt(A) != '-') {
    		System.out.println("No");
    		return;
        }
        
        for (int i = A+1; i < B+A+1; i++) {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        }
        
        System.out.println("Yes");
    }
    
} 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();
        
        for (int i = 0; i < A; i++) {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        }
        
        if (S.charAt(A) != '-') {
    		System.out.println("No");
    		return;
        }
        
        for (int i = A+1; i < B+A+1; i++) {
        	if (S.charAt(i) == '-') {
        		System.out.println("No");
        		return;
        	}
        }
        
        System.out.println("Yes");
    }
    
}