A, B = map(int,input().split())
S = input()

def check(string):
    if '-' in string:
        print('No')
        quit()

if A + B + 1 != len(S) or S[A] != '-':
    print("No")
    quit()

check(S[:A])
rev_S = S[::-1]
print(rev_S)
check(rev_S[:B])

print("Yes")
