N=int(input())
K=input()
if N<=2:
  ANS=0
  for i in range(8):
    if K[i]=='-':
      continue
    X=[(i&(1<<j))>>j for j in range(4)]
    def f(x,y):
      r=0
      for i in range(N):
        r*=2
        r+=X[((x&(1<<i))>>i)*2+((y&(1<<i))>>i)]
      return r
    
    for x in range(1<<N):
      for y in range(1<<N):
        for z in range(1<<N):
          if (f(x,y)-z)*((1-f(x,y))-z)<=0:
            ANS+=1
  print(ANS%(10**9+7))
  exit()
mod=10**9+7
ANS=0
t=pow(2,2*N,mod)
x=(pow(2,N-1,mod)-1)%mod
for i in range(8):
  if K[i]=='-':
    continue
  X=[(i&(1<<j))>>j for j in range(4)]
  Y=[X.count(0),X.count(1)]
  ANS+=t
  ANS+=x*pow(4,N-2,mod)*(Y[0]*Y[0]+Y[1]*Y[1])%mod
  ANS-=x*pow(4,N-2,mod)*(Y[0]*Y[1]+Y[1]*Y[0])%mod
  ANS+=pow(4,N,mod)*pow(2,N-1,mod)
print(ANS%mod)