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();

//        System.out.println(a);
//        System.out.println(b);
//        System.out.println(s);

        boolean flag = true;
        for (int i = 0; i < s.length(); i++) {
            if (i == a) {
                if (s.charAt(i) != '-') {
                    flag = false;
                    break;
                }
            } else {
                try {
                    int n = Integer.parseInt("" + s.charAt(i));
                } catch (Exception e) {
                    flag = false;
                    break;
                }
            }
        }

        if (flag) {
            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();

//        System.out.println(a);
//        System.out.println(b);
//        System.out.println(s);

        boolean flag = true;
        for (int i = 0; i < s.length(); i++) {
            if (i == a) {
                if (s.charAt(i) != '-') {
                    flag = false;
                    break;
                }
            } else {
                try {
                    int n = Integer.parseInt("" + s.charAt(i));
                } catch (Exception e) {
                    flag = false;
                    break;
                }
            }
        }

        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();

//        System.out.println(a);
//        System.out.println(b);
//        System.out.println(s);

        boolean flag = true;
        for (int i = 0; i < s.length(); i++) {
            if (i == a) {
                if (s.charAt(i) != '-') {
                    flag = false;
                    break;
                }
            } else {
                try {
                    int n = Integer.parseInt("" + s.charAt(i));
                } catch (Exception e) {
                    flag = false;
                    break;
                }
            }
        }

        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();

//        System.out.println(a);
//        System.out.println(b);
//        System.out.println(s);

        boolean flag = true;
        for (int i = 0; i < s.length(); i++) {
            if (i == a) {
                if (s.charAt(i) != '-') {
                    flag = false;
                    break;
                }
            } else {
                try {
                    int n = Integer.parseInt("" + s.charAt(i));
                } catch (Exception e) {
                    flag = false;
                    break;
                }
            }
        }

        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 < s.length(); i++) {
            if (i == a) {
                if (s.charAt(i) != '-') {
                    flag = false;
                    break;
                }
            } else {
                try {
                    int n = Integer.parseInt("" + s.charAt(i));
                } catch (Exception e) {
                    flag = false;
                    break;
                }
            }
        } int i = 0; int i = 0; i 0 i < s.length() i s.length() s.length s i++ i++ i {
            if (i == a) {
                if (s.charAt(i) != '-') {
                    flag = false;
                    break;
                }
            } else {
                try {
                    int n = Integer.parseInt("" + s.charAt(i));
                } catch (Exception e) {
                    flag = false;
                    break;
                }
            }
        } {
            if (i == a) {
                if (s.charAt(i) != '-') {
                    flag = false;
                    break;
                }
            } else {
                try {
                    int n = Integer.parseInt("" + s.charAt(i));
                } catch (Exception e) {
                    flag = false;
                    break;
                }
            }
        } if (i == a) {
                if (s.charAt(i) != '-') {
                    flag = false;
                    break;
                }
            } else {
                try {
                    int n = Integer.parseInt("" + s.charAt(i));
                } catch (Exception e) {
                    flag = false;
                    break;
                }
            } i == a i a {
                if (s.charAt(i) != '-') {
                    flag = false;
                    break;
                }
            } if (s.charAt(i) != '-') {
                    flag = false;
                    break;
                } s.charAt(i) != '-' s.charAt(i) s.charAt s i '-' {
                    flag = false;
                    break;
                } flag = false flag false break; {
                try {
                    int n = Integer.parseInt("" + s.charAt(i));
                } catch (Exception e) {
                    flag = false;
                    break;
                }
            } try {
                    int n = Integer.parseInt("" + s.charAt(i));
                } catch (Exception e) {
                    flag = false;
                    break;
                } catch (Exception e) {
                    flag = false;
                    break;
                } Exception e {
                    flag = false;
                    break;
                } flag = false flag false break; {
                    int n = Integer.parseInt("" + s.charAt(i));
                } int n = Integer.parseInt("" + s.charAt(i)); n Integer.parseInt("" + s.charAt(i)) Integer.parseInt Integer "" + s.charAt(i) "" s.charAt(i) s.charAt s i if (flag) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        } flag {
            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();

//        System.out.println(a);
//        System.out.println(b);
//        System.out.println(s);

        boolean flag = true;
        for (int i = 0; i < s.length(); i++) {
            if (i == a) {
                if (s.charAt(i) != '-') {
                    flag = false;
                    break;
                }
            } else {
                try {
                    int n = Integer.parseInt("" + s.charAt(i));
                } catch (Exception e) {
                    flag = false;
                    break;
                }
            }
        }

        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();

//        System.out.println(a);
//        System.out.println(b);
//        System.out.println(s);

        boolean flag = true;
        for (int i = 0; i < s.length(); i++) {
            if (i == a) {
                if (s.charAt(i) != '-') {
                    flag = false;
                    break;
                }
            } else {
                try {
                    int n = Integer.parseInt("" + s.charAt(i));
                } catch (Exception e) {
                    flag = false;
                    break;
                }
            }
        }

        if (flag) {
            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();

//        System.out.println(a);
//        System.out.println(b);
//        System.out.println(s);

        boolean flag = true;
        for (int i = 0; i < s.length(); i++) {
            if (i == a) {
                if (s.charAt(i) != '-') {
                    flag = false;
                    break;
                }
            } else {
                try {
                    int n = Integer.parseInt("" + s.charAt(i));
                } catch (Exception e) {
                    flag = false;
                    break;
                }
            }
        }

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