import java.util.*;
import static java.lang.Math.*;
import java.math.BigInteger;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		// 入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		String s = sc.next();
		
		// 計算
		String result = "No";
		String[] array = s.split("-");
		//System.out.println(Arrays.toString(array));
		if(array.length == 2 && array[0].length() == a && array[1].length() == b) result = "Yes";
		
		
		// 出力
		System.out.println(result);
	}
}

 import java.util.*; util.* java import static java.lang.Math.*; import static java.lang.Math.*; import static java.lang.Math.*; import java.math.BigInteger; BigInteger java.math public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		// 入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		String s = sc.next();
		
		// 計算
		String result = "No";
		String[] array = s.split("-");
		//System.out.println(Arrays.toString(array));
		if(array.length == 2 && array[0].length() == a && array[1].length() == b) result = "Yes";
		
		
		// 出力
		System.out.println(result);
	}
} Main public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		// 入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		String s = sc.next();
		
		// 計算
		String result = "No";
		String[] array = s.split("-");
		//System.out.println(Arrays.toString(array));
		if(array.length == 2 && array[0].length() == a && array[1].length() == b) result = "Yes";
		
		
		// 出力
		System.out.println(result);
	} main {
		Scanner sc = new Scanner(System.in);
		
		// 入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		String s = sc.next();
		
		// 計算
		String result = "No";
		String[] array = s.split("-");
		//System.out.println(Arrays.toString(array));
		if(array.length == 2 && array[0].length() == a && array[1].length() == b) result = "Yes";
		
		
		// 出力
		System.out.println(result);
	} 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 String result = "No"; result "No" String[] array = s.split("-"); array s.split("-") s.split s "-" if(array.length == 2 && array[0].length() == a && array[1].length() == b) result = "Yes"; array.length == 2 && array[0].length() == a && array[1].length() == b array.length == 2 && array[0].length() == a && array[1].length() == b array.length == 2 array.length array array.length 2 array[0].length() == a array[0].length() array[0].length array[0] array 0 a array[1].length() == b array[1].length() array[1].length array[1] array 1 b result = "Yes" result "Yes" System.out.println(result) System.out.println System.out System System.out result String[] args args public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		// 入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		String s = sc.next();
		
		// 計算
		String result = "No";
		String[] array = s.split("-");
		//System.out.println(Arrays.toString(array));
		if(array.length == 2 && array[0].length() == a && array[1].length() == b) result = "Yes";
		
		
		// 出力
		System.out.println(result);
	}
} public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		// 入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		String s = sc.next();
		
		// 計算
		String result = "No";
		String[] array = s.split("-");
		//System.out.println(Arrays.toString(array));
		if(array.length == 2 && array[0].length() == a && array[1].length() == b) result = "Yes";
		
		
		// 出力
		System.out.println(result);
	}
} Main
import java.util.*;
import static java.lang.Math.*;
import java.math.BigInteger;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		// 入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		String s = sc.next();
		
		// 計算
		String result = "No";
		String[] array = s.split("-");
		//System.out.println(Arrays.toString(array));
		if(array.length == 2 && array[0].length() == a && array[1].length() == b) result = "Yes";
		
		
		// 出力
		System.out.println(result);
	}
}


