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();
		int judge = 0;

		if(S.charAt(A) != '-') {
			judge += 1;
		}

		for(int i=0; i<A; i++) {
				if(S.charAt(i) == '-') {
					judge += 1;
				}
		}

		for(int j=0; j<B; j++) {
			if(S.charAt(A+1+j) == '-') {
				judge += 1;
			}
		}

		if(judge == 0) {
			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();
		int judge = 0;

		if(S.charAt(A) != '-') {
			judge += 1;
		}

		for(int i=0; i<A; i++) {
				if(S.charAt(i) == '-') {
					judge += 1;
				}
		}

		for(int j=0; j<B; j++) {
			if(S.charAt(A+1+j) == '-') {
				judge += 1;
			}
		}

		if(judge == 0) {
			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();
		int judge = 0;

		if(S.charAt(A) != '-') {
			judge += 1;
		}

		for(int i=0; i<A; i++) {
				if(S.charAt(i) == '-') {
					judge += 1;
				}
		}

		for(int j=0; j<B; j++) {
			if(S.charAt(A+1+j) == '-') {
				judge += 1;
			}
		}

		if(judge == 0) {
			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();
		int judge = 0;

		if(S.charAt(A) != '-') {
			judge += 1;
		}

		for(int i=0; i<A; i++) {
				if(S.charAt(i) == '-') {
					judge += 1;
				}
		}

		for(int j=0; j<B; j++) {
			if(S.charAt(A+1+j) == '-') {
				judge += 1;
			}
		}

		if(judge == 0) {
			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 int judge = 0; judge 0 if(S.charAt(A) != '-') {
			judge += 1;
		} S.charAt(A) != '-' S.charAt(A) S.charAt S A '-' {
			judge += 1;
		} judge += 1 judge 1 for(int i=0; i<A; i++) {
				if(S.charAt(i) == '-') {
					judge += 1;
				}
		} int i=0; int i=0; i 0 i<A i A i++ i++ i {
				if(S.charAt(i) == '-') {
					judge += 1;
				}
		} {
				if(S.charAt(i) == '-') {
					judge += 1;
				}
		} if(S.charAt(i) == '-') {
					judge += 1;
				} S.charAt(i) == '-' S.charAt(i) S.charAt S i '-' {
					judge += 1;
				} judge += 1 judge 1 for(int j=0; j<B; j++) {
			if(S.charAt(A+1+j) == '-') {
				judge += 1;
			}
		} int j=0; int j=0; j 0 j<B j B j++ j++ j {
			if(S.charAt(A+1+j) == '-') {
				judge += 1;
			}
		} {
			if(S.charAt(A+1+j) == '-') {
				judge += 1;
			}
		} if(S.charAt(A+1+j) == '-') {
				judge += 1;
			} S.charAt(A+1+j) == '-' S.charAt(A+1+j) S.charAt S A+1+j A+1+j A 1 j '-' {
				judge += 1;
			} judge += 1 judge 1 if(judge == 0) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		} judge == 0 judge 0 {
			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();
		int judge = 0;

		if(S.charAt(A) != '-') {
			judge += 1;
		}

		for(int i=0; i<A; i++) {
				if(S.charAt(i) == '-') {
					judge += 1;
				}
		}

		for(int j=0; j<B; j++) {
			if(S.charAt(A+1+j) == '-') {
				judge += 1;
			}
		}

		if(judge == 0) {
			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();
		int judge = 0;

		if(S.charAt(A) != '-') {
			judge += 1;
		}

		for(int i=0; i<A; i++) {
				if(S.charAt(i) == '-') {
					judge += 1;
				}
		}

		for(int j=0; j<B; j++) {
			if(S.charAt(A+1+j) == '-') {
				judge += 1;
			}
		}

		if(judge == 0) {
			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();
		int judge = 0;

		if(S.charAt(A) != '-') {
			judge += 1;
		}

		for(int i=0; i<A; i++) {
				if(S.charAt(i) == '-') {
					judge += 1;
				}
		}

		for(int j=0; j<B; j++) {
			if(S.charAt(A+1+j) == '-') {
				judge += 1;
			}
		}

		if(judge == 0) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
	}

}
