#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

int descending_compare(const void *a, const void *b){
    if (*(int*)a > *(int*)b){
        return -1;
    }else if (*(int*)a == *(int*)b){
        return 0;
    }else{
        return 1;
    }
}

int ascending_compare(const void *a, const void *b){
    if (*(int*)a < *(int*)b){
        return -1;
    }else if (*(int*)a == *(int*)b){
        return 0;
    }else{
        return 1;
    }
}


int lower_bound(int *a, int n, int key){
    int left, mid, right;
    left = 0, right = n;
    mid = (left + right)/2;
    while ((left+1 != mid || mid+1 != right) && mid != left){
        if (key > a[mid]){
            left = mid;
        }else{
            right = mid+1;
        }
        mid = (left + right)/2;
    }
    if (a[left] >= key)return left;
    if (a[mid] >= key)return mid;
    if (a[right] >= key)return right;
    return n;
}

int main(void){
    int a, b;
    char s[15];
    int flag = 0;
    scanf("%d %d", &a, &b);
    scanf(" %s", s);
    if (s[3] == '-'){
        flag = 1;
    }
    if (strlen(s) != a+b+1){
        flag = 0;
    }
    for (i = 0; i < a; i++){
        if (s[i] < '0' || s[i] > '9'){
            flag = 0;
        }
    }

    for (i = a+1; i < strlen(s); i++){
        if (s[i] < '0' || s[i] > '9'){
            flag = 0;
        }
    }

    if (flag == 1){
        printf("Yes\n");
    }else{
        printf("No\n");
    }
}
