n,K=map(int,input().split())
a=list(map(int,input().split()))
z=[0,10**10]+a
z=sorted(set(z))
d={v:i for i,v in enumerate(z)}
for i in range(n):
  a[i]=d[a[i]]
s=input()
q=[[0]*(K+2) for i in range(n)]
for i in range(n):
  q[i][1]=1
M=10**9+7
B=40
for j in range(2,K+2):
  st1=[0]*B*B
  st2=[0]*B
  for i in range(n):
    if s[j-2]=="<":
      l=0
      r=a[i]-1
    if s[j-2]==">":
      l=a[i]+1
      r=len(z)-1
    yl=l//B
    yr=r//B
    if yl==yr:
      q[i][j]+=sum(st1[l:r+1])
    else:
      q[i][j]+=sum(st1[l:yl*B+B])
      q[i][j]+=sum(st2[yl+1:yr])
      q[i][j]+=sum(st1[yr*B:r+1])
    q[i][j]%=M
    st1[a[i]]+=q[i][j-1]
    st1[a[i]]%=M
    st2[a[i]//B]+=q[i][j-1]
    st2[a[i]//B]%=M
print(sum(q[i][K+1] for i in range(n))%M)